diff --git a/ars/src/apis/likeBoard/likeBoard.service.ts b/ars/src/apis/likeBoard/likeBoard.service.ts
index d56c72f..88fb281 100644
--- a/ars/src/apis/likeBoard/likeBoard.service.ts
+++ b/ars/src/apis/likeBoard/likeBoard.service.ts
@@ -1,9 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Connection, getRepository, Repository } from 'typeorm';
-import { Board } from '../board/entities/board.entity';
 import { LikeBoard } from '../board/entities/likeBoard.entity';
-import { User } from '../user/entities/user.entity';
 
 @Injectable()
 export class LikeBoardService {
@@ -17,12 +15,14 @@ export class LikeBoardService {
   async find(userId) {
     const queryRunner = this.connection.createQueryRunner();
     await queryRunner.connect();
-    await queryRunner.startTransaction();
+    await queryRunner.startTransaction('SERIALIZABLE');
     try {
       const boards = await queryRunner.manager.find(LikeBoard, {
         where: { userId },
         relations: ['board'],
+        lock: { mode: 'pessimistic_write' },
       });
+      await queryRunner.commitTransaction();
       return boards.map((ele) => ele.board);
     } catch (error) {
       await queryRunner.rollbackTransaction();
@@ -35,9 +35,8 @@ export class LikeBoardService {
   async like(boardId, userId) {
     const queryRunner = this.connection.createQueryRunner();
     await queryRunner.connect();
-    await queryRunner.startTransaction();
+    await queryRunner.startTransaction('SERIALIZABLE');
     try {
-      const board = await queryRunner.manager.findOne(Board, { id: boardId });
       const prevLike = await queryRunner.manager.findOne(LikeBoard, {
         where: {
           userId: userId,
@@ -47,7 +46,7 @@ export class LikeBoardService {
       if (!prevLike) {
         await queryRunner.manager.save(LikeBoard, {
           userId: userId,
-          board: board,
+          board: boardId,
         });
         await queryRunner.commitTransaction();
         return true;