diff --git a/contracts/FeralfileArtworkV4_3.sol b/contracts/FeralfileArtworkV4_3.sol
index 0c3109a..bab0144 100644
--- a/contracts/FeralfileArtworkV4_3.sol
+++ b/contracts/FeralfileArtworkV4_3.sol
@@ -7,7 +7,6 @@ contract FeralfileExhibitionV4_3 is FeralfileExhibitionV4_1 {
     error InvalidOwner();
     error TokenIsNonMergeable();
     error InvalidLength();
-    error InvalidMergingStatus();
 
     struct MergeArtworkInfo {
         uint256 singleSeriesId;
@@ -16,9 +15,6 @@ contract FeralfileExhibitionV4_3 is FeralfileExhibitionV4_1 {
     }
     MergeArtworkInfo private mergeArtworkInfo;
 
-    // merging
-    bool internal _merging;
-
     constructor(
         string memory name_,
         string memory symbol_,
@@ -51,10 +47,6 @@ contract FeralfileExhibitionV4_3 is FeralfileExhibitionV4_1 {
     /// @notice burns multiples mergeable artworks and mint a new artworks
     /// @param tokenIds - list of tokenIds to be burned
     function mergeArtworks(uint256[] calldata tokenIds) external {
-        if (!_merging) {
-            revert InvalidMergingStatus();
-        }
-
         if (tokenIds.length < 2) {
             revert InvalidLength();
         }
@@ -90,24 +82,6 @@ contract FeralfileExhibitionV4_3 is FeralfileExhibitionV4_1 {
         emit MergedArtwork(_msgSender(), tokenIds, newTokenId);
     }
 
-    /// @notice Start token merging
-    function startMerging() external onlyOwner {
-        if (_merging) {
-            revert InvalidMergingStatus();
-        }
-
-        _merging = true;
-    }
-
-    /// @notice Pause token merging
-    function pauseMerging() public onlyOwner {
-        if (!_merging) {
-            revert InvalidMergingStatus();
-        }
-
-        _merging = false;
-    }
-
     /// @notice Event emitted when a merged artwork has been minted
     event MergedArtwork(
         address indexed owner,