diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapter.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapter.kt
new file mode 100644
index 0000000..5d8e3ae
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapter.kt	
@@ -0,0 +1,15 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.User
+import com.banjjoknim.springmultimodule.user.UserRepository
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterPersistencePort
+import org.springframework.stereotype.Repository
+
+@Repository
+class UserRegisterPersistenceAdapter(
+    private val userRepository: UserRepository
+) : UserRegisterPersistencePort {
+    override fun registerUser(user: User): User {
+        return userRepository.save(user)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterRequest.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterRequest.kt
new file mode 100644
index 0000000..0efda0a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterRequest.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterRequestData
+import javax.validation.constraints.NotBlank
+
+data class UserRegisterRequest(
+    @NotBlank
+    val name: String = ""
+) {
+    fun toData(): UserRegisterRequestData {
+        return UserRegisterRequestData(name)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterResponse.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterResponse.kt
new file mode 100644
index 0000000..c97e285
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterResponse.kt	
@@ -0,0 +1,11 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterResponseData
+
+data class UserRegisterResponse(
+    val userId: Long
+) {
+    constructor(responseData: UserRegisterResponseData) : this(
+        userId = responseData.userId
+    )
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapter.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapter.kt
new file mode 100644
index 0000000..c9ae005
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapter.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterUseCase
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+import javax.validation.Valid
+
+@RequestMapping("/users")
+@RestController
+class UserRegisterWebAdapter(
+    private val userRegisterUseCase: UserRegisterUseCase
+) {
+    @PostMapping("")
+    fun registerUser(@RequestBody @Valid userRegisterRequest: UserRegisterRequest): ResponseEntity<UserRegisterResponse> {
+        val requestData = userRegisterRequest.toData()
+        val responseData = userRegisterUseCase.registerUser(requestData)
+        return ResponseEntity.ok(UserRegisterResponse(responseData))
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterPersistencePort.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterPersistencePort.kt
new file mode 100644
index 0000000..96b64ee
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterPersistencePort.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+import com.banjjoknim.springmultimodule.user.User
+
+interface UserRegisterPersistencePort {
+    fun registerUser(user: User): User
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterRequestData.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterRequestData.kt
new file mode 100644
index 0000000..5fe8a98
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterRequestData.kt	
@@ -0,0 +1,3 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+data class UserRegisterRequestData(val name: String)
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterResponseData.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterResponseData.kt
new file mode 100644
index 0000000..286667d
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterResponseData.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+import com.banjjoknim.springmultimodule.user.User
+
+data class UserRegisterResponseData(val userId: Long) {
+    constructor(user: User) : this(
+        userId = user.id
+    )
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterService.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterService.kt
new file mode 100644
index 0000000..8e95320
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterService.kt	
@@ -0,0 +1,17 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+import com.banjjoknim.springmultimodule.user.User
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+
+@Service
+class UserRegisterService(
+    private val userRegisterPersistencePort: UserRegisterPersistencePort
+) : UserRegisterUseCase {
+    @Transactional
+    override fun registerUser(requestData: UserRegisterRequestData): UserRegisterResponseData {
+        val newUser = User(name = requestData.name)
+        val user = userRegisterPersistencePort.registerUser(newUser)
+        return UserRegisterResponseData(user)
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterUseCase.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterUseCase.kt
new file mode 100644
index 0000000..dbb0d85
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/main/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterUseCase.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+interface UserRegisterUseCase {
+    fun registerUser(requestData: UserRegisterRequestData): UserRegisterResponseData
+}