diff --git a/src/main/java/com/moabam/api/application/bug/BugMapper.java b/src/main/java/com/moabam/api/application/bug/BugMapper.java
index 89a4fe83..0095b05a 100644
--- a/src/main/java/com/moabam/api/application/bug/BugMapper.java
+++ b/src/main/java/com/moabam/api/application/bug/BugMapper.java
@@ -4,8 +4,8 @@
 import com.moabam.api.domain.bug.BugActionType;
 import com.moabam.api.domain.bug.BugHistory;
 import com.moabam.api.domain.bug.BugType;
-import com.moabam.api.dto.TodayBugResponse;
 import com.moabam.api.dto.bug.BugResponse;
+import com.moabam.api.dto.bug.TodayBugResponse;
 
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
diff --git a/src/main/java/com/moabam/api/application/bug/BugService.java b/src/main/java/com/moabam/api/application/bug/BugService.java
index 60222eb5..6093f51d 100644
--- a/src/main/java/com/moabam/api/application/bug/BugService.java
+++ b/src/main/java/com/moabam/api/application/bug/BugService.java
@@ -17,8 +17,8 @@
 import com.moabam.api.domain.member.Member;
 import com.moabam.api.domain.product.Product;
 import com.moabam.api.domain.product.repository.ProductRepository;
-import com.moabam.api.dto.TodayBugResponse;
 import com.moabam.api.dto.bug.BugResponse;
+import com.moabam.api.dto.bug.TodayBugResponse;
 import com.moabam.api.dto.product.ProductsResponse;
 import com.moabam.global.common.util.ClockHolder;
 
diff --git a/src/main/java/com/moabam/api/application/item/ItemMapper.java b/src/main/java/com/moabam/api/application/item/ItemMapper.java
index 7499d561..f91591df 100644
--- a/src/main/java/com/moabam/api/application/item/ItemMapper.java
+++ b/src/main/java/com/moabam/api/application/item/ItemMapper.java
@@ -27,8 +27,9 @@ public static ItemResponse toItemResponse(Item item) {
 			.build();
 	}
 
-	public static ItemsResponse toItemsResponse(List<Item> purchasedItems, List<Item> notPurchasedItems) {
+	public static ItemsResponse toItemsResponse(Long itemId, List<Item> purchasedItems, List<Item> notPurchasedItems) {
 		return ItemsResponse.builder()
+			.defaultItemId(itemId)
 			.purchasedItems(StreamUtils.map(purchasedItems, ItemMapper::toItemResponse))
 			.notPurchasedItems(StreamUtils.map(notPurchasedItems, ItemMapper::toItemResponse))
 			.build();
diff --git a/src/main/java/com/moabam/api/application/item/ItemService.java b/src/main/java/com/moabam/api/application/item/ItemService.java
index d1d278aa..3a024c2e 100644
--- a/src/main/java/com/moabam/api/application/item/ItemService.java
+++ b/src/main/java/com/moabam/api/application/item/ItemService.java
@@ -39,10 +39,11 @@ public class ItemService {
 	private final BugHistoryRepository bugHistoryRepository;
 
 	public ItemsResponse getItems(Long memberId, ItemType type) {
+		Item defaultItem = getDefaultInventory(memberId, type).getItem();
 		List<Item> purchasedItems = inventorySearchRepository.findItems(memberId, type);
 		List<Item> notPurchasedItems = itemSearchRepository.findNotPurchasedItems(memberId, type);
 
-		return ItemMapper.toItemsResponse(purchasedItems, notPurchasedItems);
+		return ItemMapper.toItemsResponse(defaultItem.getId(), purchasedItems, notPurchasedItems);
 	}
 
 	@Transactional
@@ -80,6 +81,11 @@ private Inventory getInventory(Long memberId, Long itemId) {
 			.orElseThrow(() -> new NotFoundException(INVENTORY_NOT_FOUND));
 	}
 
+	private Inventory getDefaultInventory(Long memberId, ItemType type) {
+		return inventorySearchRepository.findDefault(memberId, type)
+			.orElseThrow(() -> new NotFoundException(DEFAULT_INVENTORY_NOT_FOUND));
+	}
+
 	private void validateAlreadyPurchased(Long memberId, Long itemId) {
 		inventorySearchRepository.findOne(memberId, itemId)
 			.ifPresent(inventory -> {
diff --git a/src/main/java/com/moabam/api/dto/TodayBugResponse.java b/src/main/java/com/moabam/api/dto/bug/TodayBugResponse.java
similarity index 76%
rename from src/main/java/com/moabam/api/dto/TodayBugResponse.java
rename to src/main/java/com/moabam/api/dto/bug/TodayBugResponse.java
index fb5282d5..11ee0dcc 100644
--- a/src/main/java/com/moabam/api/dto/TodayBugResponse.java
+++ b/src/main/java/com/moabam/api/dto/bug/TodayBugResponse.java
@@ -1,4 +1,4 @@
-package com.moabam.api.dto;
+package com.moabam.api.dto.bug;
 
 import lombok.Builder;
 
diff --git a/src/main/java/com/moabam/api/dto/item/ItemsResponse.java b/src/main/java/com/moabam/api/dto/item/ItemsResponse.java
index 085d339d..70de47ec 100644
--- a/src/main/java/com/moabam/api/dto/item/ItemsResponse.java
+++ b/src/main/java/com/moabam/api/dto/item/ItemsResponse.java
@@ -6,6 +6,7 @@
 
 @Builder
 public record ItemsResponse(
+	Long defaultItemId,
 	List<ItemResponse> purchasedItems,
 	List<ItemResponse> notPurchasedItems
 ) {
diff --git a/src/main/java/com/moabam/api/presentation/BugController.java b/src/main/java/com/moabam/api/presentation/BugController.java
index 41dfa8d1..95de7f5b 100644
--- a/src/main/java/com/moabam/api/presentation/BugController.java
+++ b/src/main/java/com/moabam/api/presentation/BugController.java
@@ -7,8 +7,8 @@
 import org.springframework.web.bind.annotation.RestController;
 
 import com.moabam.api.application.bug.BugService;
-import com.moabam.api.dto.TodayBugResponse;
 import com.moabam.api.dto.bug.BugResponse;
+import com.moabam.api.dto.bug.TodayBugResponse;
 import com.moabam.api.dto.product.ProductsResponse;
 import com.moabam.global.auth.annotation.CurrentMember;
 import com.moabam.global.auth.model.AuthorizationMember;
diff --git a/src/main/java/com/moabam/global/error/model/ErrorMessage.java b/src/main/java/com/moabam/global/error/model/ErrorMessage.java
index a1bc6d53..90c493c0 100644
--- a/src/main/java/com/moabam/global/error/model/ErrorMessage.java
+++ b/src/main/java/com/moabam/global/error/model/ErrorMessage.java
@@ -40,6 +40,7 @@ public enum ErrorMessage {
 	ITEM_UNLOCK_LEVEL_HIGH("아이템 해금 레벨이 높습니다."),
 	ITEM_NOT_PURCHASABLE_BY_BUG_TYPE("해당 벌레 타입으로는 구매할 수 없는 아이템입니다."),
 	INVENTORY_NOT_FOUND("구매하지 않은 아이템은 적용할 수 없습니다."),
+	DEFAULT_INVENTORY_NOT_FOUND("현재 적용된 아이템이 없습니다."),
 	INVENTORY_CONFLICT("이미 구매한 아이템입니다."),
 
 	INVALID_BUG_COUNT("벌레 개수는 0 이상이어야 합니다."),
diff --git a/src/test/java/com/moabam/api/application/item/ItemServiceTest.java b/src/test/java/com/moabam/api/application/item/ItemServiceTest.java
index c48fcb12..c0f06cab 100644
--- a/src/test/java/com/moabam/api/application/item/ItemServiceTest.java
+++ b/src/test/java/com/moabam/api/application/item/ItemServiceTest.java
@@ -70,6 +70,8 @@ void get_products_success() {
 		ItemType type = ItemType.MORNING;
 		Item item1 = morningSantaSkin().build();
 		Item item2 = morningKillerSkin().build();
+		Inventory inventory = inventory(memberId, item1);
+		given(inventorySearchRepository.findDefault(memberId, type)).willReturn(Optional.of(inventory));
 		given(inventorySearchRepository.findItems(memberId, type)).willReturn(List.of(item1, item2));
 		given(itemSearchRepository.findNotPurchasedItems(memberId, type)).willReturn(emptyList());
 
diff --git a/src/test/java/com/moabam/api/presentation/BugControllerTest.java b/src/test/java/com/moabam/api/presentation/BugControllerTest.java
index c0bf7dbd..a2c66b1e 100644
--- a/src/test/java/com/moabam/api/presentation/BugControllerTest.java
+++ b/src/test/java/com/moabam/api/presentation/BugControllerTest.java
@@ -32,8 +32,8 @@
 import com.moabam.api.domain.bug.repository.BugHistorySearchRepository;
 import com.moabam.api.domain.product.Product;
 import com.moabam.api.domain.product.repository.ProductRepository;
-import com.moabam.api.dto.TodayBugResponse;
 import com.moabam.api.dto.bug.BugResponse;
+import com.moabam.api.dto.bug.TodayBugResponse;
 import com.moabam.api.dto.product.ProductsResponse;
 import com.moabam.support.annotation.WithMember;
 import com.moabam.support.common.WithoutFilterSupporter;
diff --git a/src/test/java/com/moabam/api/presentation/ItemControllerTest.java b/src/test/java/com/moabam/api/presentation/ItemControllerTest.java
index 78e367c4..120f210a 100644
--- a/src/test/java/com/moabam/api/presentation/ItemControllerTest.java
+++ b/src/test/java/com/moabam/api/presentation/ItemControllerTest.java
@@ -30,6 +30,7 @@
 import com.moabam.api.application.item.ItemMapper;
 import com.moabam.api.application.member.MemberService;
 import com.moabam.api.domain.bug.BugType;
+import com.moabam.api.domain.item.Inventory;
 import com.moabam.api.domain.item.Item;
 import com.moabam.api.domain.item.ItemType;
 import com.moabam.api.domain.item.repository.InventoryRepository;
@@ -70,9 +71,10 @@ void success() throws Exception {
 			// given
 			Long memberId = getAuthorizationMember().id();
 			Item item1 = itemRepository.save(morningSantaSkin().build());
-			inventoryRepository.save(inventory(memberId, item1));
+			Inventory inventory = inventoryRepository.save(inventory(memberId, item1));
+			inventory.select();
 			Item item2 = itemRepository.save(morningKillerSkin().build());
-			ItemsResponse expected = ItemMapper.toItemsResponse(List.of(item1), List.of(item2));
+			ItemsResponse expected = ItemMapper.toItemsResponse(item1.getId(), List.of(item1), List.of(item2));
 
 			// expected
 			String content = mockMvc.perform(get("/items")