diff --git a/src/main/kotlin/org/gitanimals/render/app/UserFacade.kt b/src/main/kotlin/org/gitanimals/render/app/UserFacade.kt
index 91d82f1..d61e6da 100644
--- a/src/main/kotlin/org/gitanimals/render/app/UserFacade.kt
+++ b/src/main/kotlin/org/gitanimals/render/app/UserFacade.kt
@@ -1,5 +1,6 @@
 package org.gitanimals.render.app
 
+import org.gitanimals.render.app.request.MergePersonaRequest
 import org.gitanimals.render.domain.UserService
 import org.gitanimals.render.domain.request.PersonaChangeRequest
 import org.gitanimals.render.domain.response.PersonaResponse
@@ -40,4 +41,14 @@ class UserFacade(
 
         return userService.getPersona(user.username, personaId)
     }
+
+    fun mergePersona(token: String, request: MergePersonaRequest) {
+        val user = identityApi.getUserByToken(token)
+
+        return userService.mergePersona(
+            user.id.toLong(),
+            request.increasePersonaId,
+            request.deletePersonaId,
+        )
+    }
 }
diff --git a/src/main/kotlin/org/gitanimals/render/app/request/MergePersonaRequest.kt b/src/main/kotlin/org/gitanimals/render/app/request/MergePersonaRequest.kt
new file mode 100644
index 0000000..6bed891
--- /dev/null
+++ b/src/main/kotlin/org/gitanimals/render/app/request/MergePersonaRequest.kt
@@ -0,0 +1,6 @@
+package org.gitanimals.render.app.request
+
+data class MergePersonaRequest(
+    val increasePersonaId: Long,
+    val deletePersonaId: Long,
+)
diff --git a/src/main/kotlin/org/gitanimals/render/controller/PersonaController.kt b/src/main/kotlin/org/gitanimals/render/controller/PersonaController.kt
index 7652158..f4917e5 100644
--- a/src/main/kotlin/org/gitanimals/render/controller/PersonaController.kt
+++ b/src/main/kotlin/org/gitanimals/render/controller/PersonaController.kt
@@ -2,6 +2,7 @@ package org.gitanimals.render.controller
 
 import org.gitanimals.render.app.AuthorizationException
 import org.gitanimals.render.app.UserFacade
+import org.gitanimals.render.app.request.MergePersonaRequest
 import org.gitanimals.render.controller.request.AddMultiplyPersonaRequest
 import org.gitanimals.render.controller.request.AddPersonaRequest
 import org.gitanimals.render.controller.response.ErrorResponse
@@ -72,6 +73,13 @@ class PersonaController(
         )
     }
 
+    @PutMapping("/personas/merges")
+    @ResponseStatus(HttpStatus.OK)
+    fun mergePersona(
+        @RequestHeader(HttpHeaders.AUTHORIZATION) token: String,
+        @RequestBody meregPersonaRequest: MergePersonaRequest,
+    ) = userFacade.mergePersona(token, meregPersonaRequest)
+
     @ExceptionHandler(IllegalArgumentException::class)
     @ResponseStatus(HttpStatus.BAD_REQUEST)
     fun handleIllegalArgumentException(exception: IllegalArgumentException): ErrorResponse =
diff --git a/src/main/kotlin/org/gitanimals/render/domain/User.kt b/src/main/kotlin/org/gitanimals/render/domain/User.kt
index 338a1a8..a01a128 100644
--- a/src/main/kotlin/org/gitanimals/render/domain/User.kt
+++ b/src/main/kotlin/org/gitanimals/render/domain/User.kt
@@ -205,6 +205,15 @@ class User(
         .append("</svg>")
         .toString()
 
+    fun mergePersona(increasePersonaId: Long, deletePersonaId: Long) {
+        val increasePersona = personas.first { it.id == increasePersonaId }
+        val deletePersona = personas.first { it.id == deletePersonaId }
+
+        increasePersona.level.value += deletePersona.level.value
+
+        personas.remove(deletePersona)
+    }
+
     companion object {
         private const val MAX_PERSONA_COUNT = 30L
         private const val MAX_INIT_PERSONA_COUNT = 10L
diff --git a/src/main/kotlin/org/gitanimals/render/domain/UserService.kt b/src/main/kotlin/org/gitanimals/render/domain/UserService.kt
index 6e4b7fa..1d9face 100644
--- a/src/main/kotlin/org/gitanimals/render/domain/UserService.kt
+++ b/src/main/kotlin/org/gitanimals/render/domain/UserService.kt
@@ -104,6 +104,15 @@ class UserService(
         return user.deletePersona(personaId)
     }
 
+    @Transactional
+    @Retryable(retryFor = [ObjectOptimisticLockingFailureException::class], maxAttempts = 100)
+    fun mergePersona(id: Long, increasePersonaId: Long, deletePersonaId: Long) {
+        val user = userRepository.findByIdOrNull(id)
+            ?: throw IllegalArgumentException("Cannot find user by id \"$id\"")
+
+        user.mergePersona(increasePersonaId, deletePersonaId)
+    }
+
     fun getPersona(name: String, personaId: Long): PersonaResponse {
         return getUserByName(name).personas
             .find { it.id == personaId }
diff --git a/src/test/kotlin/org/gitanimals/render/domain/UserTest.kt b/src/test/kotlin/org/gitanimals/render/domain/UserTest.kt
index 373743f..0259184 100644
--- a/src/test/kotlin/org/gitanimals/render/domain/UserTest.kt
+++ b/src/test/kotlin/org/gitanimals/render/domain/UserTest.kt
@@ -103,6 +103,22 @@ internal class UserTest : DescribeSpec({
             }
         }
     }
+
+    describe("mergePersona 메소드는") {
+        context("increasePersonaId와 deletePersonaId를 받아서,") {
+            val user = User.newUser("devxb", mapOf())
+            user.updateContribution(30)
+            user.giveNewPersona()
+
+            val increasePersonaId = user.personas.minByOrNull { it.level.value }!!.id
+            val deletePersonaId = user.personas.maxByOrNull { it.level.value }!!.id
+            it("increasePersonaId에 deletePersonasId의 level을 추가하고, deletePersona를 삭제한다") {
+                user.mergePersona(increasePersonaId, deletePersonaId)
+
+                user.personas.size shouldBeEqual 1
+            }
+        }
+    }
 }) {
     private companion object {
         private const val ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"