diff --git a/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md b/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md
deleted file mode 100644
index 1514024..0000000
--- a/.forge/SPRING-ARC-REVIEW-1783835414-attempt-2-run-77bed2c0508e.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# 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 441cbe9..c4e14df 100644
--- a/docs/architecture/transaction-sequence.md
+++ b/docs/architecture/transaction-sequence.md
@@ -1,21 +1,32 @@
 ```mermaid
 sequenceDiagram
-    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
+    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
 ```
\ No newline at end of file