diff --git a/catDataMocking/package.json b/catDataMocking/package.json
old mode 100644
new mode 100755
diff --git a/nest-user-api/package.json b/nest-user-api/package.json
old mode 100644
new mode 100755
index 6316bb4..d1fe94a
--- a/nest-user-api/package.json
+++ b/nest-user-api/package.json
@@ -23,8 +23,11 @@
     "@nestjs/common": "^11.0.1",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/typeorm": "^11.0.0",
+    "mysql2": "^3.14.1",
     "reflect-metadata": "^0.2.2",
-    "rxjs": "^7.8.1"
+    "rxjs": "^7.8.1",
+    "typeorm": "^0.3.25"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",
diff --git a/nest-user-api/src/app.module.ts b/nest-user-api/src/app.module.ts
index 73e916a..fa234ba 100644
--- a/nest-user-api/src/app.module.ts
+++ b/nest-user-api/src/app.module.ts
@@ -2,9 +2,22 @@ import { Module } from '@nestjs/common';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { UsersModule } from './users/users.module';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { User } from './users/user.entity';
 
 @Module({
-  imports: [UsersModule],
+  imports: [
+    TypeOrmModule.forRoot({
+      type: 'mysql',
+      host: 'localhost',
+      port: 3306,
+      username: 'root',
+      password: 'init00!!',
+      database: 'test_db',
+      entities: [User],
+      synchronize: true //개발용
+    }),
+    UsersModule],
   controllers: [AppController],
   providers: [AppService],
 })
diff --git a/nest-user-api/src/main.ts b/nest-user-api/src/main.ts
index f76bc8d..4d34b3b 100644
--- a/nest-user-api/src/main.ts
+++ b/nest-user-api/src/main.ts
@@ -3,6 +3,7 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+  app.enableCors();
   await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
diff --git a/nest-user-api/src/users/user.entity.ts b/nest-user-api/src/users/user.entity.ts
new file mode 100755
index 0000000..51cc769
--- /dev/null
+++ b/nest-user-api/src/users/user.entity.ts
@@ -0,0 +1,13 @@
+import { Column, Entity, PrimaryGeneratedColumn } from "typeorm";
+
+@Entity()
+export class User {
+    @PrimaryGeneratedColumn()
+    id: number;
+
+    @Column()
+    name: string;
+
+    @Column({ unique: true })
+    email: string;
+}
\ No newline at end of file
diff --git a/nest-user-api/src/users/users.controller.spec.ts b/nest-user-api/src/users/users.controller.spec.ts
old mode 100644
new mode 100755
diff --git a/nest-user-api/src/users/users.controller.ts b/nest-user-api/src/users/users.controller.ts
old mode 100644
new mode 100755
index ca52703..8cb8c4b
--- a/nest-user-api/src/users/users.controller.ts
+++ b/nest-user-api/src/users/users.controller.ts
@@ -1,4 +1,33 @@
-import { Controller } from '@nestjs/common';
+import { Body, Controller, Delete, Get, Param, Post, Put } from '@nestjs/common';
+import { UsersService } from './users.service';
+import { User } from './user.entity';
 
 @Controller('users')
-export class UsersController {}
+export class UsersController {
+    constructor(private userService: UsersService) {}
+
+    @Post()
+    create(@Body() body: Partial<User>) {
+        return this.userService.create(body);
+    }
+
+    @Get()
+    findAll() {
+        return this.userService.findAll();
+    }
+
+    @Get(":id")
+    findOne(@Param("id") id: string) {
+        return this.userService.findOne(Number(id));
+    }
+
+    @Put(":id")
+    update(@Param("id") id: string, @Body() body: Partial<User>) {
+        return this.userService.update(Number(id), body);
+    }
+
+    @Delete(":id")
+    delete(@Param("id") id: string) {
+        return this.userService.delete(Number(id));
+    }
+}
diff --git a/nest-user-api/src/users/users.module.ts b/nest-user-api/src/users/users.module.ts
old mode 100644
new mode 100755
index 8d4de4b..1a71c3a
--- a/nest-user-api/src/users/users.module.ts
+++ b/nest-user-api/src/users/users.module.ts
@@ -1,8 +1,11 @@
 import { Module } from '@nestjs/common';
 import { UsersController } from './users.controller';
 import { UsersService } from './users.service';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { User } from './user.entity';
 
 @Module({
+  imports: [TypeOrmModule.forFeature([User])],
   controllers: [UsersController],
   providers: [UsersService]
 })
diff --git a/nest-user-api/src/users/users.service.spec.ts b/nest-user-api/src/users/users.service.spec.ts
old mode 100644
new mode 100755
diff --git a/nest-user-api/src/users/users.service.ts b/nest-user-api/src/users/users.service.ts
old mode 100644
new mode 100755
index 1120356..6155629
--- a/nest-user-api/src/users/users.service.ts
+++ b/nest-user-api/src/users/users.service.ts
@@ -1,4 +1,36 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { User } from './user.entity';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
 
 @Injectable()
-export class UsersService {}
+export class UsersService {
+    constructor( @InjectRepository(User) private readonly userRepository: Repository<User>) {}
+
+    async create(user: Partial<User>): Promise<User> {
+        const newUser = this.userRepository.create(user);
+        return this.userRepository.save(newUser);
+    }
+
+    async findAll(): Promise<User[]> {
+        return this.userRepository.find();
+    }
+
+    async findOne(id: number): Promise<User> {
+        const user = await this.userRepository.findOneBy({ id });
+        if (!user)
+            throw new NotFoundException(`User with id ${id} not found`);
+        
+        return user;
+    }
+
+    async update(id: number, update: Partial<User>): Promise<User> {
+        const user = await this.findOne(id);
+        Object.assign(user, update);
+        return this.userRepository.save(user);
+    }
+
+    async delete(id: number): Promise<void> {
+        await this.userRepository.delete(id);
+    }
+}
diff --git a/package-lock.json b/package-lock.json
old mode 100644
new mode 100755
diff --git a/ts_playground/01-types.ts b/ts_playground/01-types.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/02-functions.ts b/ts_playground/02-functions.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/03-interfaces.ts b/ts_playground/03-interfaces.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/04-classes.ts b/ts_playground/04-classes.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/05-generics.ts b/ts_playground/05-generics.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/06-union-type.ts b/ts_playground/06-union-type.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/07-utility-types.ts b/ts_playground/07-utility-types.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/08-record.ts b/ts_playground/08-record.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/09-narrowing.ts b/ts_playground/09-narrowing.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/10-keyof-typeof.ts b/ts_playground/10-keyof-typeof.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/11-as-const.ts b/ts_playground/11-as-const.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/12-unknown-never.ts b/ts_playground/12-unknown-never.ts
old mode 100644
new mode 100755
diff --git a/ts_playground/package.json b/ts_playground/package.json
old mode 100644
new mode 100755
diff --git a/ts_playground/tsconfig.json b/ts_playground/tsconfig.json
old mode 100644
new mode 100755