diff --git a/build.gradle.kts b/build.gradle.kts
index 9a7cabb..e4f83e1 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,6 +5,7 @@ plugins {
     id("io.spring.dependency-management") version "1.0.9.RELEASE"
     kotlin("jvm") version "1.3.72"
     kotlin("plugin.spring") version "1.3.72"
+    kotlin("plugin.jpa") version "1.3.72"
 }
 
 group = "com.example"
@@ -20,6 +21,11 @@ dependencies {
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     implementation("org.jetbrains.kotlin:kotlin-reflect")
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("junit:junit:4.12")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.11.+")
+    runtimeOnly("mysql:mysql-connector-java")
+    testImplementation("com.h2database:h2")
     testImplementation("org.springframework.boot:spring-boot-starter-test") {
         exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
     }
diff --git a/dashboard/src/main/kotlin/com/kong/dashboard/model/createUserDto.kt b/dashboard/src/main/kotlin/com/kong/dashboard/model/createUserDto.kt
new file mode 100644
index 0000000..0d97e81
--- /dev/null
+++ b/dashboard/src/main/kotlin/com/kong/dashboard/model/createUserDto.kt
@@ -0,0 +1,6 @@
+package com.kong.dashboard.model
+
+class CreateUserDto {
+    var name: String = "";
+    var age: Int = 0;
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/config/jpaConfig.kt b/src/main/kotlin/com/example/kotlinweb/config/jpaConfig.kt
new file mode 100644
index 0000000..4a93baa
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/config/jpaConfig.kt
@@ -0,0 +1,24 @@
+package com.example.kotlinweb.config
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.data.domain.AuditorAware
+
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing
+import java.util.*
+
+
+@Configuration
+@EnableJpaAuditing(auditorAwareRef = "auditorAware")
+internal class JpaConfig {
+    @Bean
+    fun auditorAware(): AuditorAware<String> {
+        return AuditorAwareImpl()
+    }
+}
+
+internal class AuditorAwareImpl : AuditorAware<String> {
+    override fun getCurrentAuditor(): Optional<String> {
+        return Optional.of("Kong.jino")
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/controller/HealthController.kt b/src/main/kotlin/com/example/kotlinweb/controller/HealthCheckController.kt
similarity index 61%
rename from src/main/kotlin/com/example/kotlinweb/controller/HealthController.kt
rename to src/main/kotlin/com/example/kotlinweb/controller/HealthCheckController.kt
index fed3266..87378fb 100644
--- a/src/main/kotlin/com/example/kotlinweb/controller/HealthController.kt
+++ b/src/main/kotlin/com/example/kotlinweb/controller/HealthCheckController.kt
@@ -7,11 +7,10 @@ import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.ResponseBody
 
 @Controller
-class HealthController{
-
-    @get:ResponseBody
-    @get:GetMapping(value = ["/health_check.html"])
-    val ratingStatus: ResponseEntity<String>
-        get() = ResponseEntity("Health", HttpStatus.OK)
+class HealthCheckController{
 
+    @GetMapping(value = ["/health_check.html"])
+    fun getStatus():ResponseEntity<String>{
+        return ResponseEntity("Health", HttpStatus.OK)
+    }
 }
diff --git a/src/main/kotlin/com/example/kotlinweb/controller/board.kt b/src/main/kotlin/com/example/kotlinweb/controller/board.kt
new file mode 100644
index 0000000..3ca4d94
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/controller/board.kt
@@ -0,0 +1,31 @@
+package com.example.kotlinweb.controller
+
+import com.example.kotlinweb.entity.Board
+import com.example.kotlinweb.model.CreateBoardRequest
+import com.example.kotlinweb.model.UpdateBoardRequest
+import com.example.kotlinweb.service.BoardService
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.*
+
+@Controller
+class BoardController(private val boardService: BoardService){
+    @GetMapping("/board")
+    fun findAll(): ResponseEntity<List<Board>> {
+        return ResponseEntity.ok(boardService.findAll())
+    }
+    @GetMapping("/board/{id}")
+    fun findOne(@PathVariable id:Long):ResponseEntity<Board>{
+        return ResponseEntity.ok(boardService.getBoardById(id))
+    }
+    @PostMapping("/board")
+    fun create(@RequestBody requestBody: CreateBoardRequest):ResponseEntity<Board>{
+        return ResponseEntity.ok(boardService.save(requestBody))
+    }
+
+    @PatchMapping("/board/{id}")
+    fun update(@PathVariable id:Long, @RequestBody requestBody: UpdateBoardRequest):ResponseEntity<Board>{
+        return ResponseEntity.ok(boardService.update(id,requestBody))
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/controller/comment.kt b/src/main/kotlin/com/example/kotlinweb/controller/comment.kt
new file mode 100644
index 0000000..17f35cd
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/controller/comment.kt
@@ -0,0 +1,31 @@
+package com.example.kotlinweb.controller
+
+import com.example.kotlinweb.entity.Comment
+import com.example.kotlinweb.model.CreateCommentRequest
+import com.example.kotlinweb.model.UpdateCommentRequest
+import com.example.kotlinweb.service.CommentService
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.*
+
+@Controller
+class CommentController(private val commentService: CommentService){
+    @GetMapping("/comment")
+    fun findAll(): ResponseEntity<List<Comment>> {
+        return ResponseEntity.ok(commentService.findAll())
+    }
+    @GetMapping("/comment/{id}")
+    fun findOne(@PathVariable id:Long):ResponseEntity<Comment>{
+        return ResponseEntity.ok(commentService.getCommentById(id))
+    }
+    @PostMapping("/comment")
+    fun create(@RequestBody requestBody: CreateCommentRequest):ResponseEntity<Comment>{
+        return ResponseEntity.ok(commentService.save(requestBody))
+    }
+
+    @PatchMapping("/comment/{id}")
+    fun update(@PathVariable id:Long, @RequestBody requestBody: UpdateCommentRequest):ResponseEntity<Comment>{
+        return ResponseEntity.ok(commentService.update(id,requestBody))
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/controller/post.kt b/src/main/kotlin/com/example/kotlinweb/controller/post.kt
new file mode 100644
index 0000000..04384a1
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/controller/post.kt
@@ -0,0 +1,31 @@
+package com.example.kotlinweb.controller
+
+import com.example.kotlinweb.entity.Post
+import com.example.kotlinweb.model.CreatePostRequest
+import com.example.kotlinweb.model.UpdatePostRequest
+import com.example.kotlinweb.service.PostService
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.*
+
+@Controller
+class PostController(private val postService: PostService){
+    @GetMapping("/post")
+    fun findAll(): ResponseEntity<List<Post>> {
+        return ResponseEntity.ok(postService.findAll())
+    }
+    @GetMapping("/post/{id}")
+    fun findOne(@PathVariable id:Long):ResponseEntity<Post>{
+        return ResponseEntity.ok(postService.getPostById(id))
+    }
+    @PostMapping("/post")
+    fun create(@RequestBody requestBody: CreatePostRequest):ResponseEntity<Post>{
+        return ResponseEntity.ok(postService.save(requestBody))
+    }
+
+    @PatchMapping("/post/{id}")
+    fun update(@PathVariable id:Long, @RequestBody requestBody: UpdatePostRequest):ResponseEntity<Post>{
+        return ResponseEntity.ok(postService.update(id,requestBody))
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/controller/user.kt b/src/main/kotlin/com/example/kotlinweb/controller/user.kt
new file mode 100644
index 0000000..71bfbed
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/controller/user.kt
@@ -0,0 +1,31 @@
+package com.example.kotlinweb.controller
+
+import com.example.kotlinweb.entity.User
+import com.example.kotlinweb.model.CreateUserRequest
+import com.example.kotlinweb.model.UpdateUserRequest
+import com.example.kotlinweb.service.UserService
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.*
+
+@Controller
+class UserController(private val userService: UserService){
+    @GetMapping("/user")
+    fun findAll(): ResponseEntity<List<User>> {
+        return ResponseEntity.ok(userService.findAll())
+    }
+    @GetMapping("/user/{id}")
+    fun findOne(@PathVariable id:Long):ResponseEntity<User>{
+        return ResponseEntity.ok(userService.getUserById(id))
+    }
+    @PostMapping("/user")
+    fun create(@RequestBody requestBody: CreateUserRequest):ResponseEntity<User>{
+      return ResponseEntity.ok(userService.save(requestBody))
+    }
+
+    @PatchMapping("/user/{id}")
+    fun update(@PathVariable id:Long, @RequestBody requestBody: UpdateUserRequest):ResponseEntity<User>{
+        return ResponseEntity.ok(userService.update(id,requestBody))
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/entity/baseEntity.kt b/src/main/kotlin/com/example/kotlinweb/entity/baseEntity.kt
new file mode 100644
index 0000000..fbc680a
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/entity/baseEntity.kt
@@ -0,0 +1,32 @@
+package com.example.kotlinweb.entity
+
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer
+import org.springframework.data.annotation.CreatedBy
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.LastModifiedBy
+import org.springframework.data.annotation.LastModifiedDate
+import org.springframework.data.jpa.domain.support.AuditingEntityListener
+import java.time.LocalDateTime
+import javax.persistence.EntityListeners
+import javax.persistence.MappedSuperclass
+
+
+@EntityListeners(value = [AuditingEntityListener::class])
+@MappedSuperclass
+abstract class Auditable<U>{
+    @CreatedBy
+    var createdBy: U? = null
+
+    @JsonDeserialize(using = LocalDateTimeDeserializer::class)
+    @CreatedDate
+    var createdAt: LocalDateTime? = null
+
+    @LastModifiedBy
+    var updateBy: U? = null
+
+    @JsonDeserialize(using = LocalDateTimeDeserializer::class)
+    @LastModifiedDate
+    var updatedAt: LocalDateTime? = null
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/entity/board.kt b/src/main/kotlin/com/example/kotlinweb/entity/board.kt
new file mode 100644
index 0000000..9f3dcfa
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/entity/board.kt
@@ -0,0 +1,14 @@
+package com.example.kotlinweb.entity
+import com.fasterxml.jackson.annotation.JsonIgnore
+import javax.persistence.*
+
+@Entity
+@Table
+data class Board (
+        @Column
+        var title:String
+): Auditable<String>() {
+        @Id
+        @GeneratedValue(strategy = GenerationType.IDENTITY)
+        val id:Long? = null
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/entity/comment.kt b/src/main/kotlin/com/example/kotlinweb/entity/comment.kt
new file mode 100644
index 0000000..f52edc8
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/entity/comment.kt
@@ -0,0 +1,14 @@
+package com.example.kotlinweb.entity
+
+import javax.persistence.*
+
+@Entity
+@Table
+data class Comment (
+        @Column
+        var title:String
+): Auditable<String>() {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val id:Long? = null
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/entity/post.kt b/src/main/kotlin/com/example/kotlinweb/entity/post.kt
new file mode 100644
index 0000000..5683e90
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/entity/post.kt
@@ -0,0 +1,14 @@
+package com.example.kotlinweb.entity
+
+import javax.persistence.*
+
+@Entity
+@Table
+data class Post (
+        @Column
+        var title:String
+): Auditable<String>() {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val id:Long? = null
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/entity/user.kt b/src/main/kotlin/com/example/kotlinweb/entity/user.kt
new file mode 100644
index 0000000..bd17ef4
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/entity/user.kt
@@ -0,0 +1,15 @@
+package com.example.kotlinweb.entity
+
+import javax.persistence.*
+
+
+@Entity
+@Table
+data class User (
+        @Column
+        var name: String
+): Auditable<String>() {
+        @Id
+        @GeneratedValue(strategy = GenerationType.IDENTITY)
+        var id: Long? = null
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/createBoardRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/createBoardRequest.kt
new file mode 100644
index 0000000..c3e633f
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/createBoardRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class CreateBoardRequest(
+    val title:String
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/createCommentRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/createCommentRequest.kt
new file mode 100644
index 0000000..6ec3095
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/createCommentRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class CreateCommentRequest(
+    val title:String
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/createPostRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/createPostRequest.kt
new file mode 100644
index 0000000..17695b5
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/createPostRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class CreatePostRequest(
+    val title:String
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/createUserRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/createUserRequest.kt
new file mode 100644
index 0000000..adda245
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/createUserRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class CreateUserRequest(
+    val name:String
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/updateBoardRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/updateBoardRequest.kt
new file mode 100644
index 0000000..8bafa15
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/updateBoardRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class UpdateBoardRequest(
+    val title:String?
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/updateCommentRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/updateCommentRequest.kt
new file mode 100644
index 0000000..8ea9001
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/updateCommentRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class UpdateCommentRequest(
+    val title:String?
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/updatePostRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/updatePostRequest.kt
new file mode 100644
index 0000000..1b7df2a
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/updatePostRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class UpdatePostRequest(
+    val title:String?
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/model/updateUserRequest.kt b/src/main/kotlin/com/example/kotlinweb/model/updateUserRequest.kt
new file mode 100644
index 0000000..78785fc
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/model/updateUserRequest.kt
@@ -0,0 +1,5 @@
+package com.example.kotlinweb.model
+
+data class UpdateUserRequest(
+    val name:String?
+)
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/repository/board.kt b/src/main/kotlin/com/example/kotlinweb/repository/board.kt
new file mode 100644
index 0000000..dd707b1
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/repository/board.kt
@@ -0,0 +1,10 @@
+package com.example.kotlinweb.repository
+
+import com.example.kotlinweb.entity.Board
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface BoardRepository: JpaRepository<Board, Long> {
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/repository/comment.kt b/src/main/kotlin/com/example/kotlinweb/repository/comment.kt
new file mode 100644
index 0000000..8f9ad44
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/repository/comment.kt
@@ -0,0 +1,10 @@
+package com.example.kotlinweb.repository
+
+import com.example.kotlinweb.entity.Comment
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface CommentRepository: JpaRepository<Comment, Long> {
+
+}
diff --git a/src/main/kotlin/com/example/kotlinweb/repository/post.kt b/src/main/kotlin/com/example/kotlinweb/repository/post.kt
new file mode 100644
index 0000000..67989a5
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/repository/post.kt
@@ -0,0 +1,10 @@
+package com.example.kotlinweb.repository
+
+import com.example.kotlinweb.entity.Post
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface PostRepository: JpaRepository<Post, Long> {
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/repository/user.kt b/src/main/kotlin/com/example/kotlinweb/repository/user.kt
new file mode 100644
index 0000000..4203104
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/repository/user.kt
@@ -0,0 +1,10 @@
+package com.example.kotlinweb.repository
+
+import com.example.kotlinweb.entity.User
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface UserRepository:JpaRepository<User,Long>{
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/service/board.kt b/src/main/kotlin/com/example/kotlinweb/service/board.kt
new file mode 100644
index 0000000..e8287c8
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/service/board.kt
@@ -0,0 +1,28 @@
+package com.example.kotlinweb.service
+
+import com.example.kotlinweb.entity.Board
+import com.example.kotlinweb.model.CreateBoardRequest
+import com.example.kotlinweb.model.UpdateBoardRequest
+import com.example.kotlinweb.repository.BoardRepository
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.stereotype.Service
+
+@Service
+class BoardService(val boardRepository: BoardRepository){
+    fun findAll():List<Board> {
+        return boardRepository.findAll()
+    }
+
+    fun save(createBoardRequest: CreateBoardRequest): Board {
+        return boardRepository.save(Board(createBoardRequest.title))
+    }
+
+    fun getBoardById(id:Long): Board {
+        return boardRepository.findByIdOrNull(id) ?: throw Exception("There is no board with that ID.")
+    }
+
+    fun update(id:Long,updateBoardRequest: UpdateBoardRequest): Board {
+        val targetBoard: Board = getBoardById(id)
+        return boardRepository.save(targetBoard)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/service/comment.kt b/src/main/kotlin/com/example/kotlinweb/service/comment.kt
new file mode 100644
index 0000000..f0a49bf
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/service/comment.kt
@@ -0,0 +1,28 @@
+package com.example.kotlinweb.service
+
+import com.example.kotlinweb.entity.Comment
+import com.example.kotlinweb.model.CreateCommentRequest
+import com.example.kotlinweb.model.UpdateCommentRequest
+import com.example.kotlinweb.repository.CommentRepository
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.stereotype.Service
+
+@Service
+class CommentService(val commentRepository: CommentRepository){
+    fun findAll():List<Comment> {
+        return commentRepository.findAll()
+    }
+
+    fun save(createCommentRequest: CreateCommentRequest): Comment {
+        return commentRepository.save(Comment(createCommentRequest.title))
+    }
+
+    fun getCommentById(id:Long): Comment {
+        return commentRepository.findByIdOrNull(id) ?: throw Exception("There is no comment with that ID.")
+    }
+
+    fun update(id:Long,updateCommentRequest: UpdateCommentRequest): Comment {
+        val targetComment: Comment = getCommentById(id)
+        return commentRepository.save(targetComment)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/service/post.kt b/src/main/kotlin/com/example/kotlinweb/service/post.kt
new file mode 100644
index 0000000..4714620
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/service/post.kt
@@ -0,0 +1,28 @@
+package com.example.kotlinweb.service
+
+import com.example.kotlinweb.entity.Post
+import com.example.kotlinweb.model.CreatePostRequest
+import com.example.kotlinweb.model.UpdatePostRequest
+import com.example.kotlinweb.repository.PostRepository
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.stereotype.Service
+
+@Service
+class PostService(val postRepository: PostRepository){
+    fun findAll():List<Post> {
+        return postRepository.findAll()
+    }
+
+    fun save(createPostRequest: CreatePostRequest): Post {
+        return postRepository.save(Post(createPostRequest.title))
+    }
+
+    fun getPostById(id:Long): Post {
+        return postRepository.findByIdOrNull(id) ?: throw Exception("There is no post with that ID.")
+    }
+
+    fun update(id:Long,updatePostRequest: UpdatePostRequest): Post {
+        val targetPost: Post = getPostById(id)
+        return postRepository.save(targetPost)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/example/kotlinweb/service/user.kt b/src/main/kotlin/com/example/kotlinweb/service/user.kt
new file mode 100644
index 0000000..a985be4
--- /dev/null
+++ b/src/main/kotlin/com/example/kotlinweb/service/user.kt
@@ -0,0 +1,29 @@
+package com.example.kotlinweb.service
+
+import com.example.kotlinweb.entity.User
+import com.example.kotlinweb.model.CreateUserRequest
+import com.example.kotlinweb.model.UpdateUserRequest
+import com.example.kotlinweb.repository.UserRepository
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.stereotype.Service
+
+@Service
+class UserService(val userRepository: UserRepository){
+    fun findAll():List<User> {
+        return userRepository.findAll()
+    }
+
+    fun save(createUserRequest: CreateUserRequest): User {
+        return userRepository.save(User(name = createUserRequest.name))
+    }
+
+    fun getUserById(id:Long):User{
+        return userRepository.findByIdOrNull(id) ?: throw Exception("There is no user with that ID.")
+    }
+
+    fun update(id:Long,updateUserRequest: UpdateUserRequest): User {
+        val targetUser:User = getUserById(id)
+        targetUser.name=updateUserRequest.name?:targetUser.name
+        return userRepository.save(targetUser)
+    }
+}
\ No newline at end of file
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
deleted file mode 100644
index 8b13789..0000000
--- a/src/main/resources/application.properties
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
new file mode 100644
index 0000000..b29c74b
--- /dev/null
+++ b/src/main/resources/application.yml
@@ -0,0 +1,19 @@
+spring:
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://localhost:3306/data?serverTimezone=UTC&characterEncoding=UTF-8
+    username: root
+    password: 1234
+    hikari:
+      maximum-pool-size: 50
+      minimum-idle: 10
+      idle-timeout: 30000
+      connection-test-query: "SELECT 1"
+  jpa:
+    show-sql: true
+    database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
+    hibernate:
+      ddl-auto: update
+    properties:
+      hibernate:
+        format_sql: true
\ No newline at end of file
diff --git a/src/test/kotlin/com/example/kotlinweb/KotlinwebApplicationTests.kt b/src/test/kotlin/com/example/kotlinweb/KotlinwebApplicationTests.kt
index 02d9c00..3c4b3dd 100644
--- a/src/test/kotlin/com/example/kotlinweb/KotlinwebApplicationTests.kt
+++ b/src/test/kotlin/com/example/kotlinweb/KotlinwebApplicationTests.kt
@@ -1,13 +1,33 @@
 package com.example.kotlinweb
 
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.test.context.ActiveProfiles
+import org.springframework.test.context.junit.jupiter.SpringExtension
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
+import org.springframework.test.web.servlet.result.MockMvcResultHandlers.print
+import javax.transaction.Transactional
 
 @SpringBootTest
-class KotlinwebApplicationTests {
+@AutoConfigureMockMvc
+@ExtendWith(SpringExtension::class)
+@ActiveProfiles(value = ["test"])
+class StudyApplicationTests {
+
+    @Autowired
+    lateinit var mockMvc: MockMvc
 
     @Test
+    @Transactional
     fun contextLoads() {
+        mockMvc.perform(get("/health_check.html"))
+                .andExpect(status().isOk)
+                .andDo(print())
     }
 
-}
+}
\ No newline at end of file
diff --git a/src/test/kotlin/com/example/kotlinweb/e2e/user/controller.kt b/src/test/kotlin/com/example/kotlinweb/e2e/user/controller.kt
new file mode 100644
index 0000000..b5f0d1d
--- /dev/null
+++ b/src/test/kotlin/com/example/kotlinweb/e2e/user/controller.kt
@@ -0,0 +1,109 @@
+package com.example.kotlinweb.e2e.user
+
+import com.example.kotlinweb.entity.User
+import com.example.kotlinweb.model.CreateUserRequest
+import com.example.kotlinweb.model.UpdateUserRequest
+import com.fasterxml.jackson.core.type.TypeReference
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.test.context.ActiveProfiles
+import org.springframework.test.context.junit.jupiter.SpringExtension
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
+import javax.transaction.Transactional
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotEquals
+import org.springframework.http.MediaType
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*
+
+@SpringBootTest
+@AutoConfigureMockMvc
+@ExtendWith(SpringExtension::class)
+@ActiveProfiles(value = ["test"])
+class UserControllerTest {
+
+    @Autowired
+    lateinit var mockMvc: MockMvc
+    val objectMapper = jacksonObjectMapper()
+
+    @Test
+    @Transactional
+    fun getAllUser() {
+        // GIVEN
+        // WHEN
+        val apiResult = mockMvc.perform(get("/user"))
+                .andExpect(status().isOk)
+                .andReturn()
+        // THEN
+        val result =objectMapper.readValue(apiResult.response.contentAsString, object : TypeReference<List<User>>(){})
+
+        assertEquals( result , listOf<User>())
+    }
+
+    @Test
+    @Transactional
+    fun createUser() {
+        // GIVEN
+        val randomName = Math.random().toString()
+        // WHEN
+        val createUserRequestApi = mockMvc.perform(
+                    post("/user")
+                            .contentType(MediaType.APPLICATION_JSON)
+                            .content( objectMapper.writeValueAsString(CreateUserRequest(name = randomName)))
+                )
+                .andExpect(status().isOk)
+                .andReturn()
+        val createUserResult = objectMapper.readValue(createUserRequestApi.response.contentAsString, object : TypeReference<User>(){})
+
+        val userId = createUserResult.id
+        val getUserRequestApi = mockMvc.perform(get("/user/$userId"))
+                .andExpect(status().isOk)
+                .andReturn()
+
+        val result = objectMapper.readValue(getUserRequestApi.response.contentAsString, object : TypeReference<User>(){})
+        // THEN
+        assertEquals(result,createUserResult)
+    }
+
+    @Test
+    @Transactional
+    fun updateUser() {
+        // GIVEN
+        val randomName1 = Math.random().toString()
+        val randomName2 = Math.random().toString()
+        // WHEN
+        val createUserRequestApi = mockMvc.perform(
+                post("/user")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content( objectMapper.writeValueAsString(CreateUserRequest(name = randomName1)))
+        )
+                .andExpect(status().isOk)
+                .andReturn()
+        val createUserResult = objectMapper.readValue(createUserRequestApi.response.contentAsString, object : TypeReference<User>(){})
+
+        val userId = createUserResult.id
+
+        val updateUserRequestApi = mockMvc.perform(
+                patch("/user/$userId")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content( objectMapper.writeValueAsString(UpdateUserRequest(name = randomName2)))
+        )
+                .andExpect(status().isOk)
+                .andReturn()
+        val updateUserRequest = objectMapper.readValue(updateUserRequestApi.response.contentAsString, object : TypeReference<User>(){})
+
+
+        val getUserRequestApi = mockMvc.perform(get("/user/$userId"))
+                .andExpect(status().isOk)
+                .andReturn()
+
+        val getUserResult = objectMapper.readValue(getUserRequestApi.response.contentAsString, object : TypeReference<User>(){})
+        // THEN
+        assertNotEquals(getUserResult,createUserResult)
+        assertEquals(getUserResult,updateUserRequest)
+    }
+}
\ No newline at end of file
diff --git a/src/test/resources/application.yml b/src/test/resources/application.yml
new file mode 100644
index 0000000..795f206
--- /dev/null
+++ b/src/test/resources/application.yml
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    driver-class-name: org.h2.Driver
+    url: jdbc:h2:mem:default;mode=mysql
+    username: root
+    password: 1234
+    hikari:
+      maximum-pool-size: 50
+      minimum-idle: 10
+      idle-timeout: 30000
+      connection-test-query: "SELECT 1"
+  jpa:
+    show-sql: true
+    hibernate:
+      ddl-auto: update
+    properties:
+      hibernate:
+        format_sql: true
+    database: h2
+    generate-ddl: true
\ No newline at end of file