diff --git a/backend/build.gradle b/backend/build.gradle
index aa3ec58..1dfb888 100644
--- a/backend/build.gradle
+++ b/backend/build.gradle
@@ -25,14 +25,18 @@ repositories {
 
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
-	//implementation 'org.springframework.boot:spring-boot-starter-security'
+	implementation 'org.springframework.boot:spring-boot-starter-security'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
 	compileOnly 'org.projectlombok:lombok'
 	runtimeOnly 'com.mysql:mysql-connector-j'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
-	//testImplementation 'org.springframework.security:spring-security-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+	implementation 'javax.xml.bind:jaxb-api:2.3.1'
+
+	//JWT
+	implementation 'io.jsonwebtoken:jjwt:0.9.1'
 
 	// Swagger
 	implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.3.0'
diff --git a/backend/src/main/java/com/itec0401/backend/BackendApplication.java b/backend/src/main/java/com/itec0401/backend/BackendApplication.java
index 2a24804..69bb119 100644
--- a/backend/src/main/java/com/itec0401/backend/BackendApplication.java
+++ b/backend/src/main/java/com/itec0401/backend/BackendApplication.java
@@ -2,8 +2,10 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
 @SpringBootApplication
+@EnableJpaAuditing
 public class BackendApplication {
 
 	public static void main(String[] args) {
diff --git a/backend/src/main/java/com/itec0401/backend/config/SecurityConfig.java b/backend/src/main/java/com/itec0401/backend/config/SecurityConfig.java
new file mode 100644
index 0000000..c38b0ad
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/config/SecurityConfig.java
@@ -0,0 +1,28 @@
+package com.itec0401.backend.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig {
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+        http
+                .csrf((csrf) -> csrf.disable())
+                .cors((c) -> c.disable())
+                .headers((headers) -> headers.disable());
+        return http.build();
+    }
+
+    @Bean
+    public PasswordEncoder passwordEncoder(){
+        return new BCryptPasswordEncoder();
+    }
+}
\ No newline at end of file
diff --git a/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/Clothing.java b/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/Clothing.java
new file mode 100644
index 0000000..dcf34d6
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/Clothing.java
@@ -0,0 +1,43 @@
+package com.itec0401.backend.domain.clothing.entity;
+
+import com.itec0401.backend.domain.clothing.entity.type.weatherType;
+import com.itec0401.backend.domain.coordinationclothing.entity.CoordinationClothing;
+import com.itec0401.backend.domain.user.entity.User;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Clothing {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "clothing_id")
+    private Long id;
+
+    @Enumerated(EnumType.STRING)
+    private weatherType weather;
+
+    // 다른 특징들을 enum 화 할건지 테이블 만들어서 쓸 건지 결정 해야함!
+    private String category;
+
+    private String subCategory;
+
+    private String textile;
+
+    private String pattern;
+
+    private String baseColor;
+
+    private String pointColor;
+
+    @OneToMany(mappedBy = "clothing")
+    private List<CoordinationClothing> coordinationClothingList;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/type/weatherType.java b/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/type/weatherType.java
new file mode 100644
index 0000000..ac9c790
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/clothing/entity/type/weatherType.java
@@ -0,0 +1,5 @@
+package com.itec0401.backend.domain.clothing.entity.type;
+
+public enum weatherType {
+    SPRING, SUMMER, AUTUMN, WINTER
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/color/entity/Color.java b/backend/src/main/java/com/itec0401/backend/domain/color/entity/Color.java
new file mode 100644
index 0000000..9d21305
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/color/entity/Color.java
@@ -0,0 +1,29 @@
+package com.itec0401.backend.domain.color.entity;
+
+import com.itec0401.backend.domain.usercolor.entity.UserColor;
+import com.itec0401.backend.global.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Color extends BaseEntity {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "color_id")
+    private Long id;
+
+    private String color;
+
+    @OneToMany(mappedBy = "color")
+    private List<UserColor> userColors;
+
+    @Builder
+    public Color(String color) {
+        this.color = color;
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/color/repository/ColorRepository.java b/backend/src/main/java/com/itec0401/backend/domain/color/repository/ColorRepository.java
new file mode 100644
index 0000000..fc0081c
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/color/repository/ColorRepository.java
@@ -0,0 +1,10 @@
+package com.itec0401.backend.domain.color.repository;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ColorRepository extends JpaRepository<Color, Long> {
+    Optional<Color> findByColor(String color);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorService.java b/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorService.java
new file mode 100644
index 0000000..6992f01
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorService.java
@@ -0,0 +1,13 @@
+package com.itec0401.backend.domain.color.service;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.color.repository.ColorRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+
+public interface ColorService {
+    Optional<Color> findColorByName(String color);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorServiceImpl.java b/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorServiceImpl.java
new file mode 100644
index 0000000..18495ce
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/color/service/ColorServiceImpl.java
@@ -0,0 +1,22 @@
+package com.itec0401.backend.domain.color.service;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.color.repository.ColorRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+public class ColorServiceImpl implements ColorService {
+    private final ColorRepository colorRepository;
+
+    // Color 이름으로 color 객체 찾기
+    @Override
+    public Optional<Color> findColorByName(String color) {
+        return colorRepository.findByColor(color);
+    }
+
+    // Color 초기 값 생성은 관리자가 DB에 직접 넣기!
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/coordination/entity/Coordination.java b/backend/src/main/java/com/itec0401/backend/domain/coordination/entity/Coordination.java
new file mode 100644
index 0000000..199ffc3
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/coordination/entity/Coordination.java
@@ -0,0 +1,31 @@
+package com.itec0401.backend.domain.coordination.entity;
+
+import com.itec0401.backend.domain.coordinationclothing.entity.CoordinationClothing;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.global.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Coordination extends BaseEntity {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "coordination_id")
+    private Long id;
+
+    private Boolean liked;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", nullable = false)
+    private User user;
+
+    @OneToMany(mappedBy = "coordination")
+    private List<CoordinationClothing> coordinationClothingList;
+
+
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/coordinationclothing/entity/CoordinationClothing.java b/backend/src/main/java/com/itec0401/backend/domain/coordinationclothing/entity/CoordinationClothing.java
new file mode 100644
index 0000000..6fcdcd1
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/coordinationclothing/entity/CoordinationClothing.java
@@ -0,0 +1,23 @@
+package com.itec0401.backend.domain.coordinationclothing.entity;
+
+import com.itec0401.backend.domain.clothing.entity.Clothing;
+import com.itec0401.backend.domain.coordination.entity.Coordination;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class CoordinationClothing {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "clothing_id")
+    private Clothing clothing;
+
+    @ManyToOne
+    @JoinColumn(name = "coordination_id")
+    private Coordination coordination;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/style/entity/Style.java b/backend/src/main/java/com/itec0401/backend/domain/style/entity/Style.java
new file mode 100644
index 0000000..c0d98a5
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/style/entity/Style.java
@@ -0,0 +1,29 @@
+package com.itec0401.backend.domain.style.entity;
+
+import com.itec0401.backend.domain.userstyle.entity.UserStyle;
+import com.itec0401.backend.global.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Style extends BaseEntity {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "style_id")
+    private Long id;
+
+    private String style;
+
+    @OneToMany(mappedBy = "style")
+    private List<UserStyle> userStyles;
+
+    @Builder
+    public Style(String style){
+        this.style = style;
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/style/repository/StyleRepository.java b/backend/src/main/java/com/itec0401/backend/domain/style/repository/StyleRepository.java
new file mode 100644
index 0000000..84bd772
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/style/repository/StyleRepository.java
@@ -0,0 +1,10 @@
+package com.itec0401.backend.domain.style.repository;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface StyleRepository extends JpaRepository<Style, Long> {
+    Optional<Style> findByStyle(String style);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleService.java b/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleService.java
new file mode 100644
index 0000000..d6bd2f0
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleService.java
@@ -0,0 +1,9 @@
+package com.itec0401.backend.domain.style.service;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import java.util.Optional;
+
+
+public interface StyleService {
+    Optional<Style> findStyleByName(String style);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleServiceImpl.java b/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleServiceImpl.java
new file mode 100644
index 0000000..813858b
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/style/service/StyleServiceImpl.java
@@ -0,0 +1,22 @@
+package com.itec0401.backend.domain.style.service;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.style.repository.StyleRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+public class StyleServiceImpl implements StyleService {
+    private final StyleRepository styleRepository;
+
+    // Style 이름으로 style 객체 찾기
+    @Override
+    public Optional<Style> findStyleByName(String style) {
+        return styleRepository.findByStyle(style);
+    }
+
+    // Style 초기 값 생성은 관리자가 DB에 직접 넣기!
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/controller/UserController.java b/backend/src/main/java/com/itec0401/backend/domain/user/controller/UserController.java
new file mode 100644
index 0000000..6d44800
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/controller/UserController.java
@@ -0,0 +1,80 @@
+package com.itec0401.backend.domain.user.controller;
+
+import com.itec0401.backend.domain.user.dto.*;
+import com.itec0401.backend.domain.user.service.UserService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v1/user")
+public class UserController {
+    private final UserService userService;
+
+    @Operation(
+            summary = "마이 페이지 열람",
+            description = "AccessToken으로 유저 판별 후 마이페이지 내용 전송",
+            responses = {
+                    @ApiResponse(responseCode = "200", description = "마이페이지 열람 성공"),
+                    @ApiResponse(responseCode = "401", description = "마이페이지 열람 실패, 토큰 만료 여부 판단 바람")
+            }
+    )
+    @GetMapping("/profile")
+    public ResponseEntity<UserInfoDto> getUserProfile(Authentication authentication) {
+        return userService.getUserProfile(authentication);
+    }
+
+    @Operation(
+            summary = "마이 페이지 수정",
+            description = "AccessToken으로 유저 판별 후 UpdateProfileDto 내용으로 업데이트",
+            responses = {
+                    @ApiResponse(responseCode = "200", description = "마이페이지 수정 성공"),
+                    @ApiResponse(responseCode = "401", description = "권한 없음, 토큰 만료 여부 판단 바람")
+            }
+    )
+    @PutMapping("/profile")
+    public ResponseEntity<UserInfoDto> updateUserProfile(@RequestBody UpdateUserProfileDto updateUserProfileDto, Authentication authentication) {
+        return userService.updateUserProfile(updateUserProfileDto, authentication);
+    }
+
+    @Operation(
+            summary = "로그인",
+            description = "Email, Password를 확인하고 AccessToken 발행함.",
+            responses = {
+                    @ApiResponse(responseCode = "200", description = "성공적으로 로그인 되었습니다."),
+                    @ApiResponse(responseCode = "404", description = "이메일이 틀렸습니다."),
+                    @ApiResponse(responseCode = "401", description = "비밀번호가 틀렸습니다.")
+            }
+    )
+    @PostMapping("/login")
+    public ResponseEntity<LoginResponseDTO> login(@RequestBody LoginRequestDTO loginRequestDTO){
+        return userService.login(loginRequestDTO);
+    }
+
+    @Operation(
+            summary = "회원가입",
+            description = "Body에 회원정보(임시) 담아서 요청보내면 회원가입을 시켜줌. 이메일 중복 확인 후 호출해야함.",
+            responses = {
+                    @ApiResponse(responseCode = "200", description = "성공적으로 회원가입 되었습니다."),
+                    @ApiResponse(responseCode = "400", description = "회원가입 실패. 이메일 중복되었을 가능성 있음")
+            }
+    )
+    @PostMapping("/new")
+    public ResponseEntity<String> signIn(@RequestBody MemberDTO memberDTO){
+        return userService.signIn(memberDTO);
+    }
+
+    @Operation(
+            summary = "이메일 중복 확인",
+            description = "\"True: 회원가입 가능\" \"False: 회원가입 불가능\""
+    )
+    @GetMapping("/email/{email}")
+    public ResponseEntity<Boolean> isEmailEmpty(@PathVariable String email){
+        return userService.isEmailEmpty(email);
+    }
+}
\ No newline at end of file
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginRequestDTO.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginRequestDTO.java
new file mode 100644
index 0000000..9860149
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginRequestDTO.java
@@ -0,0 +1,15 @@
+package com.itec0401.backend.domain.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class LoginRequestDTO {
+    private String email;
+    private String password;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginResponseDTO.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginResponseDTO.java
new file mode 100644
index 0000000..d6391e6
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/LoginResponseDTO.java
@@ -0,0 +1,14 @@
+package com.itec0401.backend.domain.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class LoginResponseDTO {
+    private String accessToken;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/MemberDTO.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/MemberDTO.java
new file mode 100644
index 0000000..dcbe12c
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/MemberDTO.java
@@ -0,0 +1,17 @@
+package com.itec0401.backend.domain.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class MemberDTO {
+    private String name;
+    private String email;
+    private String nickName;
+    private String password;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/UpdateUserProfileDto.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UpdateUserProfileDto.java
new file mode 100644
index 0000000..e8ab4ab
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UpdateUserProfileDto.java
@@ -0,0 +1,21 @@
+package com.itec0401.backend.domain.user.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.List;
+
+@Builder
+@Getter
+public class UpdateUserProfileDto {
+    private final String nickname;
+
+    private final int gender;
+    private final int age;
+    private final double height;
+    private final double weight;
+    private final String tone;
+
+    private final List<String> colorList;
+    private final List<String> styleList;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserInfoDto.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserInfoDto.java
new file mode 100644
index 0000000..aee32d0
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserInfoDto.java
@@ -0,0 +1,48 @@
+package com.itec0401.backend.domain.user.dto;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.domain.usercolor.entity.UserColor;
+import com.itec0401.backend.domain.userstyle.entity.UserStyle;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Builder
+@Getter
+public class UserInfoDto {
+    private final String email;
+    private final String nickName;
+
+    private final int gender;
+    private final int age;
+    private final double height;
+    private final double weight;
+    private final String tone;
+
+    private final List<String> colorList;
+    private final List<String> styleList;
+
+    public static UserInfoDto toDto(User user){
+        List<String> userColors = user.getUserColorList().stream()
+                .map(userColor -> userColor.getColor().getColor())
+                .toList();
+        List<String> userStyles = user.getUserStyleList().stream()
+                .map(userStyle -> userStyle.getStyle().getStyle())
+                .toList();
+        return UserInfoDto.builder()
+                .email(user.getEmail())
+                .nickName(user.getNickname())
+                .gender(user.getGender())
+                .age(user.getAge())
+                .height(user.getHeight())
+                .weight(user.getWeight())
+                .tone(user.getTone())
+                .colorList(userColors)
+                .styleList(userStyles)
+                .build();
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserRequestDto.java b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserRequestDto.java
new file mode 100644
index 0000000..5df34af
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/dto/UserRequestDto.java
@@ -0,0 +1,21 @@
+package com.itec0401.backend.domain.user.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Builder
+@Getter
+public class UserRequestDto {
+    private final String name;
+    private final String nickname;
+    private final String email;
+
+    private final int gender;
+    private final int age;
+    private final double height;
+    private final double weight;
+    private final String tone;
+
+    private final String color;
+    private final String style;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/entity/User.java b/backend/src/main/java/com/itec0401/backend/domain/user/entity/User.java
new file mode 100644
index 0000000..c93d522
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/entity/User.java
@@ -0,0 +1,94 @@
+package com.itec0401.backend.domain.user.entity;
+
+import com.itec0401.backend.domain.coordination.entity.Coordination;
+import com.itec0401.backend.domain.user.dto.UpdateUserProfileDto;
+import com.itec0401.backend.domain.user.dto.UserRequestDto;
+import com.itec0401.backend.domain.usercolor.entity.UserColor;
+import com.itec0401.backend.domain.userstyle.entity.UserStyle;
+import com.itec0401.backend.global.BaseEntityWithUpdatedAt;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Entity
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class User extends BaseEntityWithUpdatedAt {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "user_id")
+    private Long id;
+
+    @Column(nullable = false)
+    private String name;
+
+    @Column(nullable = false)
+    private String nickname;
+
+    @Column(nullable = false, unique = true)
+    private String email;
+
+    @Column(nullable = false)
+    private String password;
+
+    // google login API 보고 email, password 필드 생각 다시 해야함
+    // google 로그인 하면 이메일, 닉네임 받아올 수 있으려나?
+
+    // 유저 추가 정보
+    private int gender;
+    private int age;
+    private double height;
+    private double weight;
+    private String tone;
+
+    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
+    private List<Coordination> coordinationList;
+
+    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
+    private List<UserStyle> userStyleList;
+
+    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
+    private List<UserColor> userColorList;
+
+    public static User toEntity(UserRequestDto userRequestDto) {
+        return User.builder()
+                .name(userRequestDto.getName())
+                .nickname(userRequestDto.getNickname())
+                .email(userRequestDto.getEmail())
+                .gender(userRequestDto.getGender())
+                .age(userRequestDto.getAge())
+                .height(userRequestDto.getHeight())
+                .weight(userRequestDto.getWeight())
+                .tone(userRequestDto.getTone())
+                .build();
+    }
+
+    public void update(UpdateUserProfileDto updateUserProfileDto) {
+        this.nickname = updateUserProfileDto.getNickname();
+        this.age = updateUserProfileDto.getAge();
+        this.gender = updateUserProfileDto.getGender();
+        this.height = updateUserProfileDto.getHeight();
+        this.weight = updateUserProfileDto.getWeight();
+        this.tone = updateUserProfileDto.getTone();
+    }
+
+    @Builder
+    public User(String name, String nickname, String email, int gender, int age, double height, double weight, String tone) {
+        this.name = name;
+        this.nickname = nickname;
+        this.email = email;
+        this.gender = gender;
+        this.age = age;
+        this.height = height;
+        this.weight = weight;
+        this.tone = tone;
+    }
+}
+
+
+
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtFilter.java b/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtFilter.java
new file mode 100644
index 0000000..eaed93f
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtFilter.java
@@ -0,0 +1,62 @@
+package com.itec0401.backend.domain.user.jwt;
+
+import io.jsonwebtoken.ExpiredJwtException;
+import io.jsonwebtoken.JwtException;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpHeaders;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+import java.util.List;
+
+@RequiredArgsConstructor
+@Component
+public class JwtFilter extends OncePerRequestFilter {
+
+    private final JwtTokenProvider jwtTokenProvider;
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
+        String authorization = request.getHeader(HttpHeaders.AUTHORIZATION);
+
+        if(authorization == null || !authorization.startsWith("Bearer ")) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+        String token = authorization.split(" ")[1];
+
+        try {
+            // JWT 토큰 유효성 검사
+            if (!jwtTokenProvider.isAccessToken(token)) {
+                filterChain.doFilter(request, response);
+                return;
+            }
+        } catch (ExpiredJwtException e) {
+            // 만료된 토큰에 대한 처리
+            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+            response.getWriter().write("Token has expired");
+            return;
+        } catch (JwtException | IllegalArgumentException e) {
+            // 기타 JWT 관련 예외 처리
+            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+            response.getWriter().write("Invalid token");
+            return;
+        }
+
+        String email = jwtTokenProvider.getEmail(token);
+
+        UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken =
+                new UsernamePasswordAuthenticationToken(email, null, List.of(new SimpleGrantedAuthority("USER")));
+
+        SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);
+        filterChain.doFilter(request, response);
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtTokenProvider.java b/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtTokenProvider.java
new file mode 100644
index 0000000..b698865
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/jwt/JwtTokenProvider.java
@@ -0,0 +1,60 @@
+package com.itec0401.backend.domain.user.jwt;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.MalformedJwtException;
+import io.jsonwebtoken.SignatureAlgorithm;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import java.time.Duration;
+import java.util.Date;
+
+@Component
+@RequiredArgsConstructor
+public class JwtTokenProvider {
+
+    private static final Long accessTokenValidTime = Duration.ofHours(2).toMillis();
+    private static final Long refreshTokenValidTime = Duration.ofDays(7).toMillis();
+
+    @Value("${JWT.SECRET-KEY}")
+    private String secretKey;
+
+
+    public String getEmail(String token){
+        return Jwts.parser()
+                .setSigningKey(secretKey)
+                .parseClaimsJws(token)
+                .getBody()
+                .get("email", String.class);
+    }
+
+    public boolean isAccessToken(String token) throws MalformedJwtException {
+        return Jwts.parser()
+                .setSigningKey(secretKey)
+                .parseClaimsJws(token)
+                .getHeader().get("type").toString().equals("access");
+    }
+
+    public String createAccessToken(String email){
+        return createJwtToken(email, secretKey, "access", accessTokenValidTime);
+    }
+
+    public String createRefreshToken(String email){
+        return createJwtToken(email, secretKey, "refresh", refreshTokenValidTime);
+    }
+
+    private String createJwtToken(String email, String secretKey, String type, Long tokenValidTime){
+        Claims claims = Jwts.claims();
+        claims.put("email", email);
+
+        return Jwts.builder()
+                .setHeaderParam("type", type)
+                .setClaims(claims)
+                .setIssuedAt(new Date(System.currentTimeMillis()))
+                .setExpiration(new Date(System.currentTimeMillis() + tokenValidTime))
+                .signWith(SignatureAlgorithm.HS256, secretKey)
+                .compact();
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/repository/UserRepository.java b/backend/src/main/java/com/itec0401/backend/domain/user/repository/UserRepository.java
new file mode 100644
index 0000000..6ec3dd9
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/repository/UserRepository.java
@@ -0,0 +1,10 @@
+package com.itec0401.backend.domain.user.repository;
+
+import com.itec0401.backend.domain.user.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findByEmail(String email);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/service/UserService.java b/backend/src/main/java/com/itec0401/backend/domain/user/service/UserService.java
new file mode 100644
index 0000000..9d7dbe7
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/service/UserService.java
@@ -0,0 +1,13 @@
+package com.itec0401.backend.domain.user.service;
+
+import com.itec0401.backend.domain.user.dto.*;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+
+public interface UserService {
+    ResponseEntity<UserInfoDto> getUserProfile(Authentication authentication);
+    ResponseEntity<LoginResponseDTO> login(LoginRequestDTO loginRequestDTO);
+    ResponseEntity<String> signIn(MemberDTO memberDTO);
+    ResponseEntity<Boolean> isEmailEmpty(String email);
+    ResponseEntity<UserInfoDto> updateUserProfile(UpdateUserProfileDto updateUserProfileDto, Authentication authentication);
+}
\ No newline at end of file
diff --git a/backend/src/main/java/com/itec0401/backend/domain/user/service/UserServiceImpl.java b/backend/src/main/java/com/itec0401/backend/domain/user/service/UserServiceImpl.java
new file mode 100644
index 0000000..56a2c44
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/user/service/UserServiceImpl.java
@@ -0,0 +1,122 @@
+package com.itec0401.backend.domain.user.service;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.color.service.ColorService;
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.style.service.StyleService;
+import com.itec0401.backend.domain.user.dto.*;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.domain.user.jwt.JwtTokenProvider;
+import com.itec0401.backend.domain.user.repository.UserRepository;
+import com.itec0401.backend.domain.usercolor.service.UserColorService;
+import com.itec0401.backend.domain.userstyle.service.UserStyleService;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+public class UserServiceImpl implements UserService{
+    private static final Logger log = LoggerFactory.getLogger(UserServiceImpl.class);
+    private final UserRepository userRepository;
+    private final JwtTokenProvider jwtTokenProvider;
+    private final PasswordEncoder passwordEncoder;
+    private final UserColorService userColorService;
+    private final UserStyleService userStyleService;
+    private final StyleService styleService;
+    private final ColorService colorService;
+
+    @Override
+    public ResponseEntity<UserInfoDto> getUserProfile(Authentication authentication){
+        // Authentication으로 이메일 파싱
+        String email = authentication.getName();
+        Optional<User> user = userRepository.findByEmail(email);
+        if (user.isEmpty()){
+            return new ResponseEntity<>(UserInfoDto.builder().build(), HttpStatus.BAD_REQUEST);
+        }
+        User validUser = user.get();
+        return new ResponseEntity<>(UserInfoDto.toDto(validUser), HttpStatus.OK);
+    }
+
+    @Override
+    public ResponseEntity<LoginResponseDTO> login(LoginRequestDTO loginRequestDTO) {
+        //AccessToken 만들어서 줘야함
+        Optional<User> byEmail = userRepository.findByEmail(loginRequestDTO.getEmail());
+        if (byEmail.isEmpty()){
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        } else if (!passwordEncoder.matches(loginRequestDTO.getPassword(), byEmail.get().getPassword())) {
+            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+        } else {
+            LoginResponseDTO loginResponseDTO = LoginResponseDTO.builder().
+                    accessToken(jwtTokenProvider.createAccessToken(loginRequestDTO.getEmail()))
+                    .build();
+            return new ResponseEntity<>(loginResponseDTO, HttpStatus.OK);
+        }
+    }
+
+    @Override
+    public ResponseEntity<String> signIn(MemberDTO memberDTO) {
+        try {
+            // 비밀번호 인코딩
+            String encoded = passwordEncoder.encode(memberDTO.getPassword());
+
+            // 회원 저장
+            User saved = userRepository.save(User.builder()
+                    .name(memberDTO.getName())
+                    .email(memberDTO.getEmail())
+                    .nickname(memberDTO.getNickName())
+                    .password(encoded)
+                    .build());
+
+            // 저장된 객체가 null인 경우 처리
+            return new ResponseEntity<>("회원가입 완료", HttpStatus.OK); // 성공 시 200 반환
+        } catch (Exception e) {
+            // 예외 발생 시 처리
+            log.info("회원가입 중 오류: " + e);
+            return new ResponseEntity<>("회원가입 실패", HttpStatus.BAD_REQUEST); // 이메일 조회 후 회원가입 할것
+        }
+    }
+
+    @Override
+    public ResponseEntity<Boolean> isEmailEmpty(String email) {
+        return new ResponseEntity<>(userRepository.findByEmail(email).isEmpty(), HttpStatus.OK);
+    }
+
+    @Override
+    @Transactional
+    public ResponseEntity<UserInfoDto> updateUserProfile(UpdateUserProfileDto updateUserProfileDto, Authentication authentication){
+        // Authentication으로 이메일 파싱
+        String email = authentication.getName();
+        // 이메일로 유저 불러오기 (없는 경우는 없겠지만 혹시나 모르니 분기)
+        Optional<User> user = userRepository.findByEmail(email);
+        if (user.isEmpty()){
+            return new ResponseEntity<>(UserInfoDto.builder().build(), HttpStatus.BAD_REQUEST);
+        }
+        User validUser = user.get();
+
+        // 컬러, 스타일 매핑 정보 모두 삭제
+        userColorService.deleteAllUserColors(validUser);
+        userStyleService.deleteAllUserStyles(validUser);
+
+        // 새롭게 컬러, 스타일 매핑
+        for (String color : updateUserProfileDto.getColorList()){
+            Optional<Color> cur = colorService.findColorByName(color);
+            cur.ifPresent(value -> userColorService.createUserColor(validUser, value));
+        }
+        for (String style : updateUserProfileDto.getStyleList()) {
+            Optional<Style> cur = styleService.findStyleByName(style);
+            cur.ifPresent(value -> userStyleService.createUserStyle(validUser, value));
+        }
+        validUser.update(updateUserProfileDto);
+        userRepository.save(validUser);
+        return new ResponseEntity<>(UserInfoDto.toDto(validUser), HttpStatus.OK);
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/usercolor/entity/UserColor.java b/backend/src/main/java/com/itec0401/backend/domain/usercolor/entity/UserColor.java
new file mode 100644
index 0000000..831dce3
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/usercolor/entity/UserColor.java
@@ -0,0 +1,30 @@
+package com.itec0401.backend.domain.usercolor.entity;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.global.BaseEntityWithUpdatedAt;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class UserColor extends BaseEntityWithUpdatedAt {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "usercolor_id")
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @ManyToOne
+    @JoinColumn(name = "color_id")
+    private Color color;
+
+    public UserColor(User user, Color color) {
+        this.user = user;
+        this.color = color;
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/usercolor/repository/UserColorRepository.java b/backend/src/main/java/com/itec0401/backend/domain/usercolor/repository/UserColorRepository.java
new file mode 100644
index 0000000..327105e
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/usercolor/repository/UserColorRepository.java
@@ -0,0 +1,14 @@
+package com.itec0401.backend.domain.usercolor.repository;
+
+import com.itec0401.backend.domain.usercolor.entity.UserColor;
+import jakarta.transaction.Transactional;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+
+public interface UserColorRepository extends JpaRepository<UserColor, Long> {
+    @Transactional
+    @Modifying
+    @Query(value = "DELETE FROM user_color WHERE user_id = ?1", nativeQuery = true)
+    void deleteByUserId(Long userId);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorService.java b/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorService.java
new file mode 100644
index 0000000..671b376
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorService.java
@@ -0,0 +1,9 @@
+package com.itec0401.backend.domain.usercolor.service;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.user.entity.User;
+
+public interface UserColorService {
+    void createUserColor(User user, Color color);
+    void deleteAllUserColors(User user);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorServiceImpl.java b/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorServiceImpl.java
new file mode 100644
index 0000000..51dd462
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/usercolor/service/UserColorServiceImpl.java
@@ -0,0 +1,29 @@
+package com.itec0401.backend.domain.usercolor.service;
+
+import com.itec0401.backend.domain.color.entity.Color;
+import com.itec0401.backend.domain.color.service.ColorService;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.domain.usercolor.entity.UserColor;
+import com.itec0401.backend.domain.usercolor.repository.UserColorRepository;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class UserColorServiceImpl implements UserColorService {
+    private final UserColorRepository userColorRepository;
+    private final ColorService colorService;
+
+    @Override
+    @Transactional
+    public void createUserColor(User user, Color color) {
+        userColorRepository.save(new UserColor(user, color));
+    }
+
+    @Override
+    @Transactional
+    public void deleteAllUserColors(User user) {
+        userColorRepository.deleteByUserId(user.getId());
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/userstyle/entity/UserStyle.java b/backend/src/main/java/com/itec0401/backend/domain/userstyle/entity/UserStyle.java
new file mode 100644
index 0000000..330214e
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/userstyle/entity/UserStyle.java
@@ -0,0 +1,29 @@
+package com.itec0401.backend.domain.userstyle.entity;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.user.entity.User;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class UserStyle {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "userstyle_id")
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @ManyToOne
+    @JoinColumn(name = "style_id")
+    private Style style;
+
+    public UserStyle(User user, Style style) {
+        this.user = user;
+        this.style = style;
+    }
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/userstyle/repository/UserStyleRepository.java b/backend/src/main/java/com/itec0401/backend/domain/userstyle/repository/UserStyleRepository.java
new file mode 100644
index 0000000..11d5ee9
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/userstyle/repository/UserStyleRepository.java
@@ -0,0 +1,14 @@
+package com.itec0401.backend.domain.userstyle.repository;
+
+import com.itec0401.backend.domain.userstyle.entity.UserStyle;
+import jakarta.transaction.Transactional;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+
+public interface UserStyleRepository extends JpaRepository<UserStyle, Long> {
+    @Transactional
+    @Modifying
+    @Query(value = "DELETE FROM user_style WHERE user_id = ?1", nativeQuery = true)
+    void deleteByUserId(Long userId);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleService.java b/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleService.java
new file mode 100644
index 0000000..b30424b
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleService.java
@@ -0,0 +1,9 @@
+package com.itec0401.backend.domain.userstyle.service;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.user.entity.User;
+
+public interface UserStyleService {
+    void createUserStyle(User user, Style style);
+    void deleteAllUserStyles(User user);
+}
diff --git a/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleServiceImpl.java b/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleServiceImpl.java
new file mode 100644
index 0000000..b3438dd
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/domain/userstyle/service/UserStyleServiceImpl.java
@@ -0,0 +1,30 @@
+package com.itec0401.backend.domain.userstyle.service;
+
+import com.itec0401.backend.domain.style.entity.Style;
+import com.itec0401.backend.domain.style.service.StyleService;
+import com.itec0401.backend.domain.user.entity.User;
+import com.itec0401.backend.domain.userstyle.entity.UserStyle;
+import com.itec0401.backend.domain.userstyle.repository.UserStyleRepository;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class UserStyleServiceImpl implements UserStyleService {
+    private final UserStyleRepository userStyleRepository;
+    private final StyleService styleService;
+
+    @Override
+    @Transactional
+    public void createUserStyle(User user, Style style) {
+        userStyleRepository.save(new UserStyle(user, style));
+    }
+
+    @Override
+    @Transactional
+    public void deleteAllUserStyles(User user) {
+        userStyleRepository.deleteByUserId(user.getId());
+    }
+
+}
diff --git a/backend/src/main/java/com/itec0401/backend/global/BaseEntity.java b/backend/src/main/java/com/itec0401/backend/global/BaseEntity.java
new file mode 100644
index 0000000..7b324d0
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/global/BaseEntity.java
@@ -0,0 +1,18 @@
+package com.itec0401.backend.global;
+
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+
+@MappedSuperclass
+@Getter
+@EntityListeners(AuditingEntityListener.class)
+public class BaseEntity {
+    @CreatedDate
+    private LocalDateTime createdAt;
+}
diff --git a/backend/src/main/java/com/itec0401/backend/global/BaseEntityWithUpdatedAt.java b/backend/src/main/java/com/itec0401/backend/global/BaseEntityWithUpdatedAt.java
new file mode 100644
index 0000000..d35a457
--- /dev/null
+++ b/backend/src/main/java/com/itec0401/backend/global/BaseEntityWithUpdatedAt.java
@@ -0,0 +1,22 @@
+package com.itec0401.backend.global;
+
+
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+@MappedSuperclass
+@Getter
+@EntityListeners(AuditingEntityListener.class)
+public class BaseEntityWithUpdatedAt {
+    @CreatedDate
+    private LocalDateTime createdAt;
+
+    @LastModifiedDate
+    private LocalDateTime updatedAt;
+}
diff --git a/backend/src/main/resources/application.yml b/backend/src/main/resources/application.yml
index f95d286..581358f 100644
--- a/backend/src/main/resources/application.yml
+++ b/backend/src/main/resources/application.yml
@@ -1,25 +1,41 @@
 spring:
-  # MySQL 관련 설정
-  profiles:
-    active: secret
   application:
     name: backend
+  datasource:
+    url: jdbc:mysql://${RDS_HOST}:${RDS_PORT}/${RDS_DB_NAME}
+    username: ${RDS_USERNAME}
+    password: ${RDS_PASSWORD}
+    driver-class-name: com.mysql.cj.jdbc.Driver
   jpa:
     hibernate:
-      ddl-auto: create
+      ddl-auto: update
       show-sql: true
-    database-platform: org.hibernate.dialect.MySQL8Dialect
+    database-platform: org.hibernate.dialect.MySQLDialect
   servlet:
     multipart:
       enabled: true
       max-file-size: 15MB
       max-request-size: 15MB
-  config:
-    additional-location: classpath:application-secret.yml
+  #  profiles:
+  #    active: secret
+  #  config:
+  #    additional-location: classpath:application-secret.yml
+  security:
+    oauth2:
+      client:
+        registration:
+          google:
+            client-id: ${GOOGLE.CLIENT-ID}
+            client-secret: ${GOOGLE.CLIENT-SECRET}
+            redirect-uri: ${GOOGLE.REDIRECT-URI}
+            scope:
+              - email
+              - profile
 logging:
   level:
     org.hibernate.SQL: DEBUG
     org.hibernate.type: TRACE
+    org.springframework.security: TRACE
 server:
   servlet:
     encoding:
@@ -27,28 +43,4 @@ server:
       enabled: true
       force: true
   tomcat:
-    max-http-form-post-size: 15MB
-# ---------- <h2 Database 관련> ----------
-#  h2:
-#    console:
-#      enabled: true
-#      path: /h2-console
-#  # H2 Setting Info (H2 Console? ???? ?? ???? ??)
-#  application:
-#    name: helpYoun
-#  datasource:
-#    driver-class-name: org.h2.Driver
-#    url: jdbc:h2:~/temp
-#    username: youn
-#    password: 1234
-#    # 인터넷 보고 추가했음
-#    # JPA 설정
-#  jpa:
-#    database-platform: org.hibernate.dialect.H2Dialect
-#    hibernate:
-#      ddl-auto: create        # DB 초기화 전략 (none, create, create-drop, update, validate)
-#    properties:
-#      hibernate:
-#        dialect: org.hibernate.dialect.H2Dialect
-#        format_sql: true      # 쿼리 로그 포맷 (정렬)
-#        show_sql: true
\ No newline at end of file
+    max-http-form-post-size: 15MB
\ No newline at end of file