diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/cart/model/mapper/CartMapper.java b/DuDoong-Api/src/main/java/band/gosrock/api/cart/model/mapper/CartMapper.java
index a3b887f2..ba365d81 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/cart/model/mapper/CartMapper.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/cart/model/mapper/CartMapper.java
@@ -13,6 +13,7 @@
 import band.gosrock.domain.domains.cart.domain.CartLineItem;
 import band.gosrock.domain.domains.cart.domain.CartOptionAnswer;
 import band.gosrock.domain.domains.cart.domain.CartValidator;
+import band.gosrock.domain.domains.event.adaptor.EventAdaptor;
 import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.ticket_item.adaptor.OptionAdaptor;
 import band.gosrock.domain.domains.ticket_item.adaptor.TicketItemAdaptor;
@@ -28,6 +29,7 @@ public class CartMapper {
     private final TicketItemAdaptor ticketItemAdaptor;
     private final OptionAdaptor optionAdaptor;
     private final CartValidator cartValidator;
+    private final EventAdaptor eventAdaptor;
 
     private final CartAdaptor cartAdaptor;
 
@@ -45,7 +47,7 @@ public CartResponse toCartResponse(Cart cart) {
     private CartResponse getCartResponse(Cart cart) {
         List<CartLineItem> newCartLineItems = cart.getCartLineItems();
         TicketItem ticketItem = ticketItemAdaptor.queryTicketItem(cart.getItemId());
-        Event event = ticketItem.getEvent();
+        Event event = eventAdaptor.findById(ticketItem.getEventId());
         List<CartItemResponse> cartItemResponses =
                 getCartItemResponses(newCartLineItems, ticketItem.getName());
 
diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/order/model/dto/response/OrderBriefElement.java b/DuDoong-Api/src/main/java/band/gosrock/api/order/model/dto/response/OrderBriefElement.java
index cc767ae9..1c7bb20d 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/order/model/dto/response/OrderBriefElement.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/order/model/dto/response/OrderBriefElement.java
@@ -37,7 +37,7 @@ public class OrderBriefElement {
     private final String itemName;
 
     @Schema(description = "아이템 총 갯수")
-    private final int totalQuantity;
+    private final Long totalQuantity;
 
     public static OrderBriefElement of(Order order, Event event, IssuedTickets issuedTickets) {
         return OrderBriefElement.builder()
@@ -48,7 +48,7 @@ public static OrderBriefElement of(Order order, Event event, IssuedTickets issue
                 .orderStatus(order.getOrderStatus())
                 .eventProfile(event.toEventProfileVo())
                 .itemName(order.getOrderName())
-                .totalQuantity(issuedTickets.getTotalQuantity())
+                .totalQuantity(order.getTotalQuantity())
                 .build();
     }
 }
diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketItemMapper.java b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketItemMapper.java
index e8cf2370..b89afcf7 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketItemMapper.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketItemMapper.java
@@ -22,7 +22,7 @@ public class TicketItemMapper {
     private final TicketItemAdaptor ticketItemAdaptor;
     private final EventAdaptor eventAdaptor;
 
-    public TicketItem toTicketItem(CreateTicketItemRequest createTicketItemRequest, Event event) {
+    public TicketItem toTicketItem(CreateTicketItemRequest createTicketItemRequest, Long eventId) {
 
         return TicketItem.builder()
                 .payType(createTicketItemRequest.getPayType())
@@ -38,7 +38,7 @@ public TicketItem toTicketItem(CreateTicketItemRequest createTicketItemRequest,
                 .accountHolder(createTicketItemRequest.getAccountHolder())
                 .isQuantityPublic(createTicketItemRequest.getIsQuantityPublic())
                 .isSellable(true)
-                .event(event)
+                .eventId(eventId)
                 .build();
     }
 
diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketOptionMapper.java b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketOptionMapper.java
index 5eb01ff1..91b6f306 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketOptionMapper.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/mapper/TicketOptionMapper.java
@@ -27,9 +27,9 @@ public class TicketOptionMapper {
     private final OptionGroupAdaptor optionGroupAdaptor;
 
     public OptionGroup toOptionGroup(
-            CreateTicketOptionRequest createTicketOptionRequest, Event event) {
+            CreateTicketOptionRequest createTicketOptionRequest, Long eventId) {
         return OptionGroup.builder()
-                .event(event)
+                .eventId(eventId)
                 .type(createTicketOptionRequest.getType())
                 .name(createTicketOptionRequest.getName())
                 .description(createTicketOptionRequest.getDescription())
diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketItemUseCase.java b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketItemUseCase.java
index d682dce1..311f17c4 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketItemUseCase.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketItemUseCase.java
@@ -36,7 +36,7 @@ public TicketItemResponse execute(
         Boolean isPartner = host.getPartner();
         TicketItem ticketItem =
                 ticketItemService.createTicketItem(
-                        ticketItemMapper.toTicketItem(createTicketItemRequest, event), isPartner);
+                        ticketItemMapper.toTicketItem(createTicketItemRequest, eventId), isPartner);
 
         return TicketItemResponse.from(ticketItem, true);
     }
diff --git a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketOptionUseCase.java b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketOptionUseCase.java
index 9e3c98ea..6e87478f 100644
--- a/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketOptionUseCase.java
+++ b/DuDoong-Api/src/main/java/band/gosrock/api/ticketItem/service/CreateTicketOptionUseCase.java
@@ -10,7 +10,6 @@
 import band.gosrock.common.annotation.UseCase;
 import band.gosrock.domain.common.vo.Money;
 import band.gosrock.domain.domains.event.adaptor.EventAdaptor;
-import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.ticket_item.domain.OptionGroup;
 import band.gosrock.domain.domains.ticket_item.service.TicketOptionService;
 import lombok.RequiredArgsConstructor;
@@ -27,11 +26,9 @@ public class CreateTicketOptionUseCase {
     public OptionGroupResponse execute(
             CreateTicketOptionRequest createTicketOptionRequest, Long eventId) {
 
-        Event event = eventAdaptor.findById(eventId);
-
         OptionGroup ticketOption =
                 ticketOptionMapper
-                        .toOptionGroup(createTicketOptionRequest, event)
+                        .toOptionGroup(createTicketOptionRequest, eventId)
                         .createTicketOption(
                                 Money.wons(createTicketOptionRequest.getAdditionalPrice()));
         OptionGroup ticketOptionResult = ticketOptionService.createTicketOption(ticketOption);
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/cart/domain/CartValidator.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/cart/domain/CartValidator.java
index 4a613b84..95f03849 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/cart/domain/CartValidator.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/cart/domain/CartValidator.java
@@ -4,6 +4,7 @@
 import band.gosrock.common.annotation.Validator;
 import band.gosrock.domain.domains.cart.exception.CartItemNotOneTypeException;
 import band.gosrock.domain.domains.cart.exception.CartNotAnswerAllOptionGroupException;
+import band.gosrock.domain.domains.event.adaptor.EventAdaptor;
 import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.issuedTicket.adaptor.IssuedTicketAdaptor;
 import band.gosrock.domain.domains.ticket_item.adaptor.OptionAdaptor;
@@ -20,6 +21,7 @@ public class CartValidator {
 
     private final TicketItemAdaptor itemAdaptor;
     private final IssuedTicketAdaptor issuedTicketAdaptor;
+    private final EventAdaptor eventAdaptor;
 
     private final OptionAdaptor optionAdaptor;
 
@@ -27,7 +29,7 @@ public void validCanCreate(Cart cart) {
         validItemKindIsOneType(cart);
         validCorrectAnswer(cart);
         TicketItem item = getItem(cart);
-        Event event = item.getEvent();
+        Event event = eventAdaptor.findById(item.getEventId());
         validAnswerToAllQuestion(cart, item);
         validEventIsOpen(event);
         validTicketingTime(event);
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/issuedTicket/service/OrderToIssuedTicketService.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/issuedTicket/service/OrderToIssuedTicketService.java
index 554464e1..4f750a46 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/issuedTicket/service/OrderToIssuedTicketService.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/issuedTicket/service/OrderToIssuedTicketService.java
@@ -25,7 +25,7 @@ public class OrderToIssuedTicketService {
     public List<IssuedTicket> execute(TicketItem ticketItem, String orderUuid, Long userId) {
         User user = userAdaptor.queryUser(userId);
         Order order = orderAdaptor.findByOrderUuid(orderUuid);
-        Long eventId = ticketItem.getEvent().getId();
+        Long eventId = ticketItem.getEventId();
         return order.getOrderLineItems().stream()
                 .map(
                         orderLineItem ->
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/OptionGroupAdaptor.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/OptionGroupAdaptor.java
index c1b1dd23..4ead0539 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/OptionGroupAdaptor.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/OptionGroupAdaptor.java
@@ -22,7 +22,7 @@ public OptionGroup queryOptionGroup(Long optionGroupId) {
     }
 
     public List<OptionGroup> findAllByEventId(Long eventId) {
-        return optionGroupRepository.findAllByEvent_IdAndOptionGroupStatus(
+        return optionGroupRepository.findAllByEventIdAndOptionGroupStatus(
                 eventId, OptionGroupStatus.VALID);
     }
 
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/TicketItemAdaptor.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/TicketItemAdaptor.java
index 1fe71a13..c01a778d 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/TicketItemAdaptor.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/adaptor/TicketItemAdaptor.java
@@ -22,12 +22,12 @@ public TicketItem queryTicketItem(Long ticketItemId) {
     }
 
     public List<TicketItem> findAllByEventId(Long eventId) {
-        return ticketItemRepository.findAllByEvent_IdAndTicketItemStatus(
+        return ticketItemRepository.findAllByEventIdAndTicketItemStatus(
                 eventId, TicketItemStatus.VALID);
     }
 
     public Boolean existsByEventId(Long eventId) {
-        return ticketItemRepository.existsByEvent_Id(eventId);
+        return ticketItemRepository.existsByEventId(eventId);
     }
 
     public TicketItem save(TicketItem ticketItem) {
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/OptionGroup.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/OptionGroup.java
index db31fd32..4ae1b230 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/OptionGroup.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/OptionGroup.java
@@ -6,7 +6,6 @@
 import static band.gosrock.domain.domains.ticket_item.domain.OptionGroupType.*;
 
 import band.gosrock.domain.common.vo.Money;
-import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.ticket_item.exception.ForbiddenOptionGroupDeleteException;
 import band.gosrock.domain.domains.ticket_item.exception.InvalidOptionGroupException;
 import java.util.ArrayList;
@@ -28,9 +27,7 @@ public class OptionGroup {
     @Column(name = "option_group_id")
     private Long id;
 
-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "event_id", nullable = false)
-    private Event event;
+    private Long eventId;
 
     // 옵션 그룹 응답 형식
     @Enumerated(EnumType.STRING)
@@ -55,13 +52,13 @@ public class OptionGroup {
 
     @Builder
     public OptionGroup(
-            Event event,
+            Long eventId,
             OptionGroupType type,
             String name,
             String description,
             Boolean isEssential,
             List<Option> options) {
-        this.event = event;
+        this.eventId = eventId;
         this.type = type;
         this.name = name;
         this.description = description;
@@ -72,7 +69,7 @@ public OptionGroup(
     }
 
     public void validateEventId(Long eventId) {
-        if (!this.getEvent().getId().equals(eventId)) {
+        if (!this.getEventId().equals(eventId)) {
             throw InvalidOptionGroupException.EXCEPTION;
         }
     }
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/TicketItem.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/TicketItem.java
index 20bc9797..026d82c7 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/TicketItem.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/domain/TicketItem.java
@@ -5,7 +5,6 @@
 import band.gosrock.domain.common.model.BaseTimeEntity;
 import band.gosrock.domain.common.vo.AccountInfoVo;
 import band.gosrock.domain.common.vo.Money;
-import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.ticket_item.exception.*;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
@@ -73,9 +72,7 @@ public class TicketItem extends BaseTimeEntity {
     @ColumnDefault(value = "'VALID'")
     private TicketItemStatus ticketItemStatus = TicketItemStatus.VALID;
 
-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "event_id", nullable = false)
-    private Event event;
+    private Long eventId;
 
     @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true)
     private final List<ItemOptionGroup> itemOptionGroups = new ArrayList<>();
@@ -97,7 +94,7 @@ public TicketItem(
             Boolean isSellable,
             LocalDateTime saleStartAt,
             LocalDateTime saleEndAt,
-            Event event) {
+            Long eventId) {
         this.payType = payType;
         this.name = name;
         this.description = description;
@@ -111,7 +108,7 @@ public TicketItem(
         this.isSellable = isSellable;
         this.saleStartAt = saleStartAt;
         this.saleEndAt = saleEndAt;
-        this.event = event;
+        this.eventId = eventId;
     }
 
     public void addItemOptionGroup(OptionGroup optionGroup) {
@@ -161,7 +158,7 @@ public void softDeleteTicketItem() {
     }
 
     public void validateEventId(Long eventId) {
-        if (!this.getEvent().getId().equals(eventId)) {
+        if (!this.getEventId().equals(eventId)) {
             throw InvalidTicketItemException.EXCEPTION;
         }
     }
@@ -254,6 +251,6 @@ public Boolean isSold() {
     }
 
     public Long getEventId() {
-        return event.getId();
+        return eventId;
     }
 }
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/OptionGroupRepository.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/OptionGroupRepository.java
index 3d131885..6e03b407 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/OptionGroupRepository.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/OptionGroupRepository.java
@@ -12,5 +12,5 @@ public interface OptionGroupRepository extends JpaRepository<OptionGroup, Long>
     Optional<OptionGroup> findByIdAndOptionGroupStatus(
             Long optionGroupId, OptionGroupStatus status);
 
-    List<OptionGroup> findAllByEvent_IdAndOptionGroupStatus(Long eventId, OptionGroupStatus status);
+    List<OptionGroup> findAllByEventIdAndOptionGroupStatus(Long eventId, OptionGroupStatus status);
 }
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/TicketItemRepository.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/TicketItemRepository.java
index 4d072dba..d5e5aca2 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/TicketItemRepository.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/ticket_item/repository/TicketItemRepository.java
@@ -9,9 +9,9 @@
 
 public interface TicketItemRepository extends JpaRepository<TicketItem, Long> {
 
-    List<TicketItem> findAllByEvent_IdAndTicketItemStatus(Long eventId, TicketItemStatus status);
+    List<TicketItem> findAllByEventIdAndTicketItemStatus(Long eventId, TicketItemStatus status);
 
-    Boolean existsByEvent_Id(Long eventId);
+    Boolean existsByEventId(Long eventId);
 
     Optional<TicketItem> findByIdAndTicketItemStatus(Long ticketItemId, TicketItemStatus status);
 }
diff --git a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/user/domain/User.java b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/user/domain/User.java
index 2adb28e7..591a5786 100644
--- a/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/user/domain/User.java
+++ b/DuDoong-Domain/src/main/java/band/gosrock/domain/domains/user/domain/User.java
@@ -104,8 +104,7 @@ public EmailUserInfo toEmailUserInfo() {
     }
 
     public AlimTalkUserInfo toAlimTalkUserInfo() throws NumberParseException {
-        if (profile.getPhoneNumberVo().getPhoneNumber() == null
-                || profile.getPhoneNumberVo().getPhoneNumber().isEmpty()) {
+        if (profile.getPhoneNumberVo() == null) {
             throw EmptyPhoneNumException.EXCEPTION;
         }
         return new AlimTalkUserInfo(
diff --git a/DuDoong-Domain/src/test/java/band/gosrock/domain/domains/cart/domain/CartValidatorTest.java b/DuDoong-Domain/src/test/java/band/gosrock/domain/domains/cart/domain/CartValidatorTest.java
index cb3fae69..69497f9b 100644
--- a/DuDoong-Domain/src/test/java/band/gosrock/domain/domains/cart/domain/CartValidatorTest.java
+++ b/DuDoong-Domain/src/test/java/band/gosrock/domain/domains/cart/domain/CartValidatorTest.java
@@ -9,6 +9,7 @@
 
 import band.gosrock.domain.domains.cart.exception.CartItemNotOneTypeException;
 import band.gosrock.domain.domains.cart.exception.CartNotAnswerAllOptionGroupException;
+import band.gosrock.domain.domains.event.adaptor.EventAdaptor;
 import band.gosrock.domain.domains.event.domain.Event;
 import band.gosrock.domain.domains.event.exception.EventNotOpenException;
 import band.gosrock.domain.domains.event.exception.EventTicketingTimeIsPassedException;
@@ -43,12 +44,15 @@ class CartValidatorTest {
     @Mock TicketItem item;
 
     @Mock IssuedTicketAdaptor issuedTicketAdaptor;
+    @Mock EventAdaptor eventAdaptor;
 
     CartValidator cartValidator;
 
     @BeforeEach
     void setUp() {
-        cartValidator = new CartValidator(ticketItemAdaptor, issuedTicketAdaptor, optionAdaptor);
+        cartValidator =
+                new CartValidator(
+                        ticketItemAdaptor, issuedTicketAdaptor, eventAdaptor, optionAdaptor);
     }
 
     @Test