diff --git a/src/main/java/com/example/egobook_be/domain/ego_room/service/EgoRoomService.java b/src/main/java/com/example/egobook_be/domain/ego_room/service/EgoRoomService.java
index 1236cfe..8fe9adf 100644
--- a/src/main/java/com/example/egobook_be/domain/ego_room/service/EgoRoomService.java
+++ b/src/main/java/com/example/egobook_be/domain/ego_room/service/EgoRoomService.java
@@ -23,7 +23,6 @@
 import jakarta.persistence.EntityNotFoundException;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.antlr.v4.runtime.misc.LogManager;
 import org.springframework.data.domain.*;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -317,8 +316,6 @@ public void unlockWeeklyCounsel(Long userId, LocalDate startDate, UnlockType typ
         // 잉크 사용 시 처리
         if (type == UnlockType.INK) {
             User user = counsel.getUser();
-            if (user.getInk() < 10) throw new CustomException(EgoRoomErrorCode.INSUFFICIENT_INK);
-
             user.useInk(10);
             // 잉크 로그 작성
             inkLogRepository.save(new InkLog(user, -10, InkLogType.WEEKLY_UNLOCK));
diff --git a/src/main/java/com/example/egobook_be/domain/letters/service/PlazaLetterService.java b/src/main/java/com/example/egobook_be/domain/letters/service/PlazaLetterService.java
index f9a1e2a..1b766ab 100644
--- a/src/main/java/com/example/egobook_be/domain/letters/service/PlazaLetterService.java
+++ b/src/main/java/com/example/egobook_be/domain/letters/service/PlazaLetterService.java
@@ -1,8 +1,6 @@
 package com.example.egobook_be.domain.letters.service;
 
 
-import com.example.egobook_be.domain.diary.dto.DiaryCreateResDto;
-import com.example.egobook_be.domain.diary.enums.RewardType;
 import com.example.egobook_be.domain.friend.repository.FriendRepository;
 import com.example.egobook_be.domain.home.entity.Mission;
 import com.example.egobook_be.domain.home.repository.MissionRepository;
@@ -139,7 +137,7 @@ public CreateLetterResponse createLetter(Long userId, CreateLetterRequest reques
 
 // 3. 잉크 차감 (유료일 때만)
         if (price > 0) {
-            user.usingInk(price);   // 부족하면 여기서 예외 발생
+            user.useInk(price);   // 부족하면 여기서 예외 발생
 
             InkLog inkLog = InkLog.builder()
                     .user(user)
diff --git a/src/main/java/com/example/egobook_be/domain/shop/sevice/ShopService.java b/src/main/java/com/example/egobook_be/domain/shop/sevice/ShopService.java
index cb64c01..91ba49e 100644
--- a/src/main/java/com/example/egobook_be/domain/shop/sevice/ShopService.java
+++ b/src/main/java/com/example/egobook_be/domain/shop/sevice/ShopService.java
@@ -115,19 +115,20 @@ public ItemInfoResDto purchaseItem(Long userId, PurchaseItemReqDto reqDto){
         }
 
         // 2. 해당 사용자가 아이템을 살 수 있는지 확인한다.
-        if(user.getInk() < item.getPrice()) throw new CustomException(ShopErrorCode.INSUFFICIENT_INK_TO_BUY_ITEM);
-
-        // 3. 해당 아이템을 구매한다. (UserItem Table에 새로운 객체를 추가한다.)
-        UserItem userItem = UserItem.builder()
-                .user(user)
-                .item(item)
-                .isEquipped(false)
-                .build();
-        userItem = userItemRepository.save(userItem);
-        user.purchaseItem(item.getPrice());
-
-        // 4. 아이템 구매 후, 해당 아이템에 대한 정보를 반환한다.
-        return userItemMapper.toItemInfoResDto(userItem, item, getShopCloudFrontDomain());
+        if(user.getInk() >= item.getPrice()){
+            // 3. 해당 아이템을 구매한다. (UserItem Table에 새로운 객체를 추가한다.)
+            UserItem userItem = UserItem.builder()
+                    .user(user)
+                    .item(item)
+                    .isEquipped(false)
+                    .build();
+            userItem = userItemRepository.save(userItem);
+            user.useInk(item.getPrice());
+
+            // 4. 아이템 구매 후, 해당 아이템에 대한 정보를 반환한다.
+            return userItemMapper.toItemInfoResDto(userItem, item, getShopCloudFrontDomain());
+        }
+        throw new CustomException(ShopErrorCode.INSUFFICIENT_INK_TO_BUY_ITEM);
     }
 
     /**
diff --git a/src/main/java/com/example/egobook_be/domain/user/entity/User.java b/src/main/java/com/example/egobook_be/domain/user/entity/User.java
index ef33acb..eba1c6b 100644
--- a/src/main/java/com/example/egobook_be/domain/user/entity/User.java
+++ b/src/main/java/com/example/egobook_be/domain/user/entity/User.java
@@ -167,15 +167,7 @@ public void addInk(int amount) {
         this.ink += amount;
     }
 
-    public void purchaseItem(int price){
-        this.ink -= price;
-    }
-
     public void useInk(int price){
-        this.ink -= price;
-    }
-
-    public void usingInk(int price){
         if (price <= 0) return;
 
         if (this.ink == null || this.ink < price) {