diff --git a/likenft/contracts/Class.sol b/likenft/contracts/Class.sol
index 353b217..1f06ec8 100644
--- a/likenft/contracts/Class.sol
+++ b/likenft/contracts/Class.sol
@@ -50,8 +50,6 @@ contract Class is ERC721A, Ownable {
         $.name = msgNewClass.input.name;
         $.symbol = msgNewClass.input.symbol;
         $.data.metadata = msgNewClass.input.metadata;
-        $.data.parent.type_ = msgNewClass.parent.type_;
-        $.data.parent.iscn_id_prefix = msgNewClass.parent.iscn_id_prefix;
         $.data.config = msgNewClass.input.config;
     }
 
@@ -81,7 +79,6 @@ contract Class is ERC721A, Ownable {
 
         for (uint i = 0; i < quantity; i++) {
             uint256 _tokenId = nextTokenId + i;
-            nftDataMap[_tokenId].class_parent = $.data.parent;
             nftDataMap[_tokenId].metadata = metadata_list[i];
         }
     }
diff --git a/likenft/scripts/examples/newClass.ts b/likenft/scripts/examples/newClass.ts
index ad19094..b855c5f 100644
--- a/likenft/scripts/examples/newClass.ts
+++ b/likenft/scripts/examples/newClass.ts
@@ -18,11 +18,6 @@ async function newClass() {
 
   const tx = await likeNFT.newClass({
     creator: signer.address,
-    parent: {
-      type_: 1,
-      iscn_id_prefix:
-        "iscn://likecoin-chain/FyZ13m_hgwzUC6UoaS3vFdYvdG6QXfajU3vcatw7X1c",
-    },
     input: {
       name: "《所謂「我不投資」，就是 all in 在法定貨幣》",
       symbol: "BOOK",
diff --git a/likenft/test/LikeNFT.test.ts b/likenft/test/LikeNFT.test.ts
index 46ffcb2..bd83676 100644
--- a/likenft/test/LikeNFT.test.ts
+++ b/likenft/test/LikeNFT.test.ts
@@ -33,11 +33,6 @@ describe("LikeNFT", () => {
       await likeNFTOwnerSigner
         .newClass({
           creator: this.ownerSigner,
-          parent: {
-            type_: 1,
-            iscn_id_prefix:
-              "iscn://likecoin-chain/FyZ13m_hgwzUC6UoaS3vFdYvdG6QXfajU3vcatw7X1c/1",
-          },
           input: {
             name: "My Book",
             symbol: "KOOB",
@@ -78,11 +73,6 @@ describe("LikeNFT", () => {
       await likeNFTOwnerSigner
         .newClass({
           creator: this.ownerSigner,
-          parent: {
-            type_: 1,
-            iscn_id_prefix:
-              "iscn://likecoin-chain/FyZ13m_hgwzUC6UoaS3vFdYvdG6QXfajU3vcatw7X1c/1",
-          },
           input: {
             name: "My Book",
             symbol: "KOOB",
@@ -149,11 +139,6 @@ describe("LikeNFT class operations", () => {
     likeNFTOwnerSigner
       .newClass({
         creator: this.ownerSigner,
-        parent: {
-          type_: 1,
-          iscn_id_prefix:
-            "iscn://likecoin-chain/FyZ13m_hgwzUC6UoaS3vFdYvdG6QXfajU3vcatw7X1c/1",
-        },
         input: {
           name: "My Book",
           symbol: "KOOB",
@@ -376,11 +361,6 @@ describe("LikeNFT token operations", () => {
     likeNFTOwnerSigner
       .newClass({
         creator: this.ownerSigner,
-        parent: {
-          type_: 1,
-          iscn_id_prefix:
-            "iscn://likecoin-chain/FyZ13m_hgwzUC6UoaS3vFdYvdG6QXfajU3vcatw7X1c/1",
-        },
         input: {
           name: "My Book",
           symbol: "KOOB",
diff --git a/likenft/types/Class.sol b/likenft/types/Class.sol
index b8b5070..1b0c065 100644
--- a/likenft/types/Class.sol
+++ b/likenft/types/Class.sol
@@ -2,7 +2,6 @@
 pragma solidity ^0.8.9;
 
 import {ClassConfig} from "./ClassConfig.sol";
-import {ClassParent} from "./ClassParent.sol";
 
 struct ClassStorage {
     string name;
@@ -12,6 +11,5 @@ struct ClassStorage {
 
 struct ClassDataStorage {
     string metadata;
-    ClassParent parent;
     ClassConfig config;
 }
diff --git a/likenft/types/ClassParent.sol b/likenft/types/ClassParent.sol
deleted file mode 100644
index dcfe4c3..0000000
--- a/likenft/types/ClassParent.sol
+++ /dev/null
@@ -1,15 +0,0 @@
-// SPDX-License-Identifier: MIT
-pragma solidity ^0.8.9;
-
-struct ClassParent {
-    ClassParentType type_;
-    string iscn_id_prefix;
-    uint64 iscn_version_at_mint;
-    address account;
-}
-
-enum ClassParentType {
-    UNKNOWN,
-    ISCN,
-    ACCOUNT
-}
diff --git a/likenft/types/ClassParentInput.sol b/likenft/types/ClassParentInput.sol
deleted file mode 100644
index a4c1508..0000000
--- a/likenft/types/ClassParentInput.sol
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: MIT
-pragma solidity ^0.8.9;
-
-import {ClassParentType} from "./ClassParent.sol";
-
-struct ClassParentInput {
-    ClassParentType type_;
-    string iscn_id_prefix;
-}
diff --git a/likenft/types/NFTData.sol b/likenft/types/NFTData.sol
index f275347..787cc08 100644
--- a/likenft/types/NFTData.sol
+++ b/likenft/types/NFTData.sol
@@ -1,9 +1,6 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.9;
 
-import {ClassParent} from "./ClassParent.sol";
-
 struct NFTData {
     string metadata;
-    ClassParent class_parent;
 }
diff --git a/likenft/types/msgs/MsgNewClass.sol b/likenft/types/msgs/MsgNewClass.sol
index 90ebccb..f4ce398 100644
--- a/likenft/types/msgs/MsgNewClass.sol
+++ b/likenft/types/msgs/MsgNewClass.sol
@@ -2,10 +2,8 @@
 pragma solidity ^0.8.9;
 
 import {ClassInput} from "../ClassInput.sol";
-import {ClassParentInput} from "../ClassParentInput.sol";
 
 struct MsgNewClass {
     address creator;
-    ClassParentInput parent;
     ClassInput input;
 }