diff --git a/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md b/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md
new file mode 100644
index 0000000..1514024
--- /dev/null
+++ b/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md
@@ -0,0 +1,3 @@
+# SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e
+
+Forge 이슈 작업 브랜치 `forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e`.
diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
index c4e14df..441cbe9 100644
--- a/docs/architecture/transaction-sequence.md
+++ b/docs/architecture/transaction-sequence.md
@@ -1,32 +1,21 @@
 ```mermaid
 sequenceDiagram
-    participant User
-    participant PaymentGateway
-    participant PaymentService
-    participant Database
-
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Success
-    PaymentService->>Database: Record Payment
-    Database-->>-PaymentService: Payment Recorded
-    PaymentService-->>-User: Payment Confirmed
-
-    %% External Failure
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Failed
-    PaymentService-->>-User: Payment Failed
-
-    %% DB Failure
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Success
-    PaymentService->>Database: Record Payment
-    Database-->>-PaymentService: DB Failure
-    PaymentService-->>-User: Payment Processing Error
-
-    %% Commit/Rollback
-    Note over PaymentService: Commit if successful
-    Note over PaymentService: Rollback if there's an error
+    participant A as User
+    participant B as Payment Processor
+    participant C as External Gateway
+    A->>B: 결제 요청
+    B->>C: 결제 정보 전달
+    alt 성공
+        C-->>B: 성공 응답
+        B-->>A: 결제 완료
+        note right of A: 결제 성공 처리
+    else 외부 실패
+        C-->>B: 실패 응답
+        B-->>A: 결제 실패
+        note right of A: 실패 처리 및 재시도
+    else DB 실패
+        B->>B: 롤백 처리
+        B-->>A: 결제 실패
+        note right of A: 롤백 기록
+    end
 ```
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