diff --git a/src/main/java/com/example/egobook_be/domain/letters/controller/PlazaLetterController.java b/src/main/java/com/example/egobook_be/domain/letters/controller/PlazaLetterController.java
index 9c3aade..f9df0fb 100644
--- a/src/main/java/com/example/egobook_be/domain/letters/controller/PlazaLetterController.java
+++ b/src/main/java/com/example/egobook_be/domain/letters/controller/PlazaLetterController.java
@@ -51,22 +51,7 @@ public class PlazaLetterController {
             description = "성공",
             content = @Content(
                     mediaType = "application/json",
-                    schema = @Schema(implementation = InboxNextResponse.class),
-                    examples = @ExampleObject(
-                            name = "example",
-                            value =
-                                    "{\n" +
-                                            "  \"letter\": {\n" +
-                                            "    \"letterId\": 301,\n" +
-                                            "    \"status\": \"ARRIVED\",\n" +
-                                            "    \"mode\": \"RANDOM\",\n" +
-                                            "    \"fromLabel\": \"익명\",\n" +
-                                            "    \"content\": \"요즘 너무 지치는데… 어떻게 버티지?\",\n" +
-                                            "    \"arrivedAt\": \"2026-01-04T10:00:00+09:00\",\n" +
-                                            "    \"replyDeadlineAt\": \"2026-01-05T10:00:00+09:00\"\n" +
-                                            "  }\n" +
-                                            "}"
-                    )
+                    schema = @Schema(implementation = InboxNextResponse.class)
             )
     )
     @GetMapping("/inbox/next")
diff --git a/src/main/java/com/example/egobook_be/domain/letters/dto/response/InboxNextResponse.java b/src/main/java/com/example/egobook_be/domain/letters/dto/response/InboxNextResponse.java
index 8ae0f9a..67850af 100644
--- a/src/main/java/com/example/egobook_be/domain/letters/dto/response/InboxNextResponse.java
+++ b/src/main/java/com/example/egobook_be/domain/letters/dto/response/InboxNextResponse.java
@@ -28,6 +28,7 @@ public static class LetterDto {
         private String content;
         private OffsetDateTime arrivedAt;
         private OffsetDateTime replyDeadlineAt;
+        private String backgroundColor;
     }
 
     public static InboxNextResponse empty() {
diff --git a/src/main/java/com/example/egobook_be/domain/letters/mapper/PlazaLetterMapper.java b/src/main/java/com/example/egobook_be/domain/letters/mapper/PlazaLetterMapper.java
index ac59be6..22ec415 100644
--- a/src/main/java/com/example/egobook_be/domain/letters/mapper/PlazaLetterMapper.java
+++ b/src/main/java/com/example/egobook_be/domain/letters/mapper/PlazaLetterMapper.java
@@ -48,6 +48,7 @@ public InboxNextResponse toResponse(PlazaLetter letter) {
                         .content(letter.getContent())
                         .arrivedAt(letter.getArrivedAt())
                         .replyDeadlineAt(letter.getReplyDeadlineAt())
+                        .backgroundColor(letter.getBackgroundColor().name())
                         .build())
                 .build();
     }