diff --git a/src/modules/folders/folders.v2.service.ts b/src/modules/folders/folders.v2.service.ts
index b6e840f..1abc1df 100644
--- a/src/modules/folders/folders.v2.service.ts
+++ b/src/modules/folders/folders.v2.service.ts
@@ -3,7 +3,6 @@ import {
   Injectable,
   NotFoundException,
 } from '@nestjs/common';
-import { Types } from 'mongoose';
 import { sum } from '@src/common';
 import { FolderType } from '@src/infrastructure/database/types/folder-type.enum';
 import { PostsPGRepository } from '../posts/posts.pg.repository';
@@ -71,21 +70,21 @@ export class FoldersV2Service {
       id: null,
       name: '전체',
       type: FolderType.ALL,
-      userId: new Types.ObjectId(userId),
+      userId,
       postCount: allPostCount,
     };
     const favorite = {
       id: null,
       name: '즐겨찾기',
       type: FolderType.FAVORITE,
-      userId: new Types.ObjectId(userId),
+      userId,
       postCount: favoritePostCount,
     };
     const readLater = {
       id: defaultFolder.id,
       name: defaultFolder.name,
       type: FolderType.DEFAULT,
-      userId: new Types.ObjectId(userId),
+      userId,
       postCount: allPostCount - customFoldersPostCount,
     };
 
diff --git a/src/modules/posts/posts.pg.repository.ts b/src/modules/posts/posts.pg.repository.ts
index cc12946..c787001 100644
--- a/src/modules/posts/posts.pg.repository.ts
+++ b/src/modules/posts/posts.pg.repository.ts
@@ -133,11 +133,12 @@ export class PostsPGRepository extends Repository<Post> {
 
   async getPostCountByFolderIds(folderIds: string[]) {
     const posts = await this.createQueryBuilder('post')
-      .select('folderId')
-      .addSelect('COUNT(id)', 'count')
-      .where('folderId IN (:...folderIds)', {
+      .select('post.folderId', 'folderId')
+      .addSelect('COUNT(post.id)', 'count')
+      .where('post.folderId IN (:...folderIds)', {
         folderIds,
       })
+      .groupBy('post.folderId')
       .getRawMany<{ folderId: string; postCount: string }>();
 
     const result = posts.map((folder) => ({