diff --git a/Application-Module/src/main/kotlin/com/asap/application/letter/port/in/GetSendLetterUsecase.kt b/Application-Module/src/main/kotlin/com/asap/application/letter/port/in/GetSendLetterUsecase.kt
index 3448ce3..cf520a2 100644
--- a/Application-Module/src/main/kotlin/com/asap/application/letter/port/in/GetSendLetterUsecase.kt
+++ b/Application-Module/src/main/kotlin/com/asap/application/letter/port/in/GetSendLetterUsecase.kt
@@ -31,6 +31,7 @@ interface GetSendLetterUsecase {
             val content: String,
             val images: List<String>,
             val templateType: Int,
+            val letterCode: String?,
         ) : Response()
     }
 }
diff --git a/Application-Module/src/main/kotlin/com/asap/application/letter/service/LetterQueryService.kt b/Application-Module/src/main/kotlin/com/asap/application/letter/service/LetterQueryService.kt
index 6040f56..5d47356 100644
--- a/Application-Module/src/main/kotlin/com/asap/application/letter/service/LetterQueryService.kt
+++ b/Application-Module/src/main/kotlin/com/asap/application/letter/service/LetterQueryService.kt
@@ -201,6 +201,7 @@ class LetterQueryService(
             content = letter.content.content,
             images = letter.content.images,
             templateType = letter.content.templateType,
+            letterCode = letter.letterCode,
         )
     }
 }
diff --git a/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/controller/LetterController.kt b/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/controller/LetterController.kt
index f826255..753738c 100644
--- a/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/controller/LetterController.kt
+++ b/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/controller/LetterController.kt
@@ -237,6 +237,7 @@ class LetterController(
             content = response.content,
             images = response.images,
             templateType = response.templateType,
+            letterCode = response.letterCode,
         )
     }
 
diff --git a/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/dto/SendLetterDetailResponse.kt b/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/dto/SendLetterDetailResponse.kt
index 0d54859..a40622c 100644
--- a/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/dto/SendLetterDetailResponse.kt
+++ b/Bootstrap-Module/src/main/kotlin/com/asap/bootstrap/letter/dto/SendLetterDetailResponse.kt
@@ -8,4 +8,5 @@ data class SendLetterDetailResponse(
     val content: String,
     val images: List<String>,
     val templateType: Int,
+    val letterCode: String?,
 )
diff --git a/Bootstrap-Module/src/test/kotlin/com/asap/bootstrap/acceptance/letter/controller/LetterControllerTest.kt b/Bootstrap-Module/src/test/kotlin/com/asap/bootstrap/acceptance/letter/controller/LetterControllerTest.kt
index ac6c0e5..e503090 100644
--- a/Bootstrap-Module/src/test/kotlin/com/asap/bootstrap/acceptance/letter/controller/LetterControllerTest.kt
+++ b/Bootstrap-Module/src/test/kotlin/com/asap/bootstrap/acceptance/letter/controller/LetterControllerTest.kt
@@ -500,6 +500,7 @@ class LetterControllerTest : LetterAcceptanceSupporter() {
                 content = "content",
                 images = listOf("images"),
                 templateType = 1,
+                letterCode = "letterCode",
             )
         BDDMockito
             .given(
@@ -542,6 +543,10 @@ class LetterControllerTest : LetterAcceptanceSupporter() {
                 exists()
                 isNumber()
             }
+            jsonPath("$.letterCode") {
+                exists()
+                isString()
+            }
         }
     }