diff --git a/proto/c2se/backend/identity.proto b/proto/c2se/backend/identity.proto
index 164e87a..7e51efd 100644
--- a/proto/c2se/backend/identity.proto
+++ b/proto/c2se/backend/identity.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package bet.beteran.c2se.backend.identity;
 
+import "protobuf/rpc/error.proto";
+
 // subject = bet.beteran.c2se.backend.identity.Signin
 message SigninRequest {
   string token = 1;
@@ -11,6 +13,10 @@ message SigninRequest {
 }
 
 message SigninResponse {
-  string session_id = 1;
+  message Result {
+    string session_id = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
diff --git a/proto/c2se/backend/member.proto b/proto/c2se/backend/member.proto
index 6b738e7..7a94e1b 100644
--- a/proto/c2se/backend/member.proto
+++ b/proto/c2se/backend/member.proto
@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package bet.beteran.c2se.backend.member;
 
+import "protobuf/rpc/error.proto";
 import "protobuf/pagination/pagination.proto";
 import "protobuf/pagination/search.proto";
 import "protobuf/pagination/sort.proto";
@@ -17,7 +18,11 @@ message ListMembersRequest {
 }
 
 message ListMembersResponse {
-  repeated bet.beteran.member.Member members = 1;
+  message Result {
+    repeated bet.beteran.member.Member members = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 // subject = bet.beteran.c2se.backend.member.GetMember
@@ -26,7 +31,11 @@ message GetMemberRequest {
 }
 
 message GetMemberResponse {
-  bet.beteran.member.Member member = 1;
+  message Result {
+    bet.beteran.member.Member member = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 // subject = bet.beteran.c2se.backend.member.GetMemberByUsername
@@ -35,5 +44,9 @@ message GetMemberByUsernameRequest {
 }
 
 message GetMemberByUsernameResponse {
-  bet.beteran.member.Member member = 1;
+  message Result {
+    bet.beteran.member.Member member = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
diff --git a/proto/c2se/common/identity.proto b/proto/c2se/common/identity.proto
index 6f4684a..0456b3e 100644
--- a/proto/c2se/common/identity.proto
+++ b/proto/c2se/common/identity.proto
@@ -2,13 +2,19 @@ syntax = "proto3";
 
 package bet.beteran.c2se.common.identity;
 
+import "protobuf/rpc/error.proto";
+
 // subject = bet.beteran.c2se.common.identity.CheckUsernameForDuplication;
 message CheckUsernameForDuplicationRequest {
   string username = 1;
 }
 
 message CheckUsernameForDuplicationResponse {
-  bool duplicated = 1;
+  message Result {
+    bool duplicated = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 // subject = bet.beteran.c2se.common.identity.CheckNicknameForDuplication;
@@ -17,7 +23,11 @@ message CheckNicknameForDuplicationRequest {
 }
 
 message CheckNicknameForDuplicationResponse {
-  bool duplicated = 1;
+  message Result {
+    bool duplicated = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 
@@ -26,6 +36,10 @@ message CaptchaRequest {
 }
 
 message CaptchaResponse {
-  string token = 1;
-  string image = 2;
+  message Result {
+    string token = 1;
+    string image = 2;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
diff --git a/proto/c2se/core/network.proto b/proto/c2se/core/network.proto
index c6146c2..d84db8e 100644
--- a/proto/c2se/core/network.proto
+++ b/proto/c2se/core/network.proto
@@ -1 +1,5 @@
+syntax = "proto3";
+
+package bet.beteran.c2se.core.network;
+
 // header = bet.beteran.c2se.core.network.Client
diff --git a/proto/c2se/frontend/identity.proto b/proto/c2se/frontend/identity.proto
index 2b1127a..27da9fe 100644
--- a/proto/c2se/frontend/identity.proto
+++ b/proto/c2se/frontend/identity.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package bet.beteran.c2se.frontend.identity;
 
+import "protobuf/rpc/error.proto";
+
 // subject = bet.beteran.c2se.frontend.identity.Signin
 message SigninRequest {
   string token = 1;
@@ -11,5 +13,9 @@ message SigninRequest {
 }
 
 message SigninResponse {
-  string session_id = 1;
+  message Result {
+    string session_id = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
diff --git a/proto/ss/member/identity.proto b/proto/ss/member/identity.proto
index 49177d4..b86be42 100644
--- a/proto/ss/member/identity.proto
+++ b/proto/ss/member/identity.proto
@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package bet.beteran.ss.member.identity;
 
+import "protobuf/rpc/error.proto";
 import "models/core/network.proto";
 
 
@@ -12,7 +13,11 @@ message CheckUsernameForDuplicationRequest {
 }
 
 message CheckUsernameForDuplicationResponse {
-  bool duplicated = 1;
+  message Result {
+    bool duplicated = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 // subject = bet.beteran.ss.member.identity.CheckNicknameForDuplication;
@@ -22,7 +27,11 @@ message CheckNicknameForDuplicationRequest {
 }
 
 message CheckNicknameForDuplicationResponse {
-  bool duplicated = 1;
+  message Result {
+    bool duplicated = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 // subject = bet.beteran.ss.member.identity.Captcha
@@ -31,8 +40,12 @@ message CaptchaRequest {
 }
 
 message CaptchaResponse {
-  string token = 1;
-  string image = 2;
+  message Result {
+    string token = 1;
+    string image = 2;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }
 
 
@@ -46,5 +59,9 @@ message SigninRequest {
 }
 
 message SigninResponse {
-  string session_id = 1;
+  message Result {
+    string session_id = 1;
+  }
+  optional bet.protobuf.rpc.Error error = 1;
+  optional Result result = 2;
 }