diff --git a/api/src/test/java/moa/acceptance/freind/FriendAcceptanceTest.java b/api/src/test/java/moa/acceptance/freind/FriendAcceptanceTest.java
index 439a0f00..01c14bf7 100644
--- a/api/src/test/java/moa/acceptance/freind/FriendAcceptanceTest.java
+++ b/api/src/test/java/moa/acceptance/freind/FriendAcceptanceTest.java
@@ -54,6 +54,30 @@ class 연락처_동기화_API {
             // then
             assertStatus(response, OK);
         }
+
+        @Test
+        void 연락처에_동일한_번호가_존재하면_둘_중_아무거나_하나의_이름으로_추가된다() {
+            // given
+            말랑_token = login(말랑);
+            var request = new SyncContactRequest(
+                    new ContactRequest("주예스", "010-2222-2222"),
+                    new ContactRequest("주노", "010-2222-2222"),
+                    new ContactRequest("주예스", "010-2222-2222")
+            );
+
+            // when
+            연락처_동기화(말랑_token, request);
+
+            // then
+            var response = 내_친구_목록_조회_요청(말랑_token);
+            List<FriendResponse> result = response.as(new TypeRef<>() {
+            });
+            assertThat(result)
+                    .hasSize(1)
+                    .element(0)
+                    .extracting(FriendResponse::customNickname)
+                    .isIn("주노", "주예스");
+        }
     }
 
     @Nested
diff --git a/core/src/main/java/moa/client/discord/DiscordWebHookApiClient.java b/core/src/main/java/moa/client/discord/DiscordWebHookApiClient.java
index ee31e30d..313e13b5 100644
--- a/core/src/main/java/moa/client/discord/DiscordWebHookApiClient.java
+++ b/core/src/main/java/moa/client/discord/DiscordWebHookApiClient.java
@@ -15,7 +15,7 @@ public interface DiscordWebHookApiClient {
      * https://discord.com/developers/docs/resources/webhook
      */
     @PostExchange(url = "/webhooks/{webhookId}/{webhookToken}", contentType = APPLICATION_JSON_VALUE)
-    Void sendMessage(
+    void sendMessage(
             @PathVariable("webhookId") String webhookId,
             @PathVariable("webhookToken") String webhookToken,
             @RequestBody DiscordSendMessageRequest request
diff --git a/core/src/main/java/moa/friend/application/command/MakeFromContactCommand.java b/core/src/main/java/moa/friend/application/command/MakeFromContactCommand.java
index d06c9b90..ef9d8f6a 100644
--- a/core/src/main/java/moa/friend/application/command/MakeFromContactCommand.java
+++ b/core/src/main/java/moa/friend/application/command/MakeFromContactCommand.java
@@ -17,8 +17,11 @@ public record ContactInfo(
 
     public Map<String, String> phoneAndNameMap() {
         return contactList.stream()
-                .collect(toMap(ContactInfo::phoneNumber, ContactInfo::name));
-
+                .collect(toMap(
+                        ContactInfo::phoneNumber,
+                        ContactInfo::name,
+                        (order, recent) -> recent
+                ));
     }
 
     public List<String> phones() {