diff --git a/data/libraries.xml b/data/libraries.xml
index 4b39581e..574a765e 100644
--- a/data/libraries.xml
+++ b/data/libraries.xml
@@ -616,11 +616,11 @@
         <path aa="AA">visualpython - numpy</path>
         <desc>Numpy 패키지 라이브러리</desc>
 
-        <item id="np_importNumpy" type="function" level="1" name="import" tag="넘파이, IMPORT NUMPY">
+        <!-- <item id="np_importNumpy" type="function" level="1" name="import" tag="넘파이, IMPORT NUMPY">
             <path>visualpython - numpy - import numpy</path>
             <desc>Import Numpy</desc>
             <file>numpy/pageList/numpyImport/numpyImport.js</file>
-        </item>
+        </item> -->
 
         <item id="pkg_arrayCreation" type="package" level="1" name="Array creation" tag="넘파이, NUMPY, FUNCTION">
             <path aa="AA">visualpython - numpy - array creation</path>
@@ -1210,11 +1210,11 @@
             <desc>변수 조회해서 복사하는 화면</desc>
             <file>pandas/variables.js</file>
         </item> -->
-        <item id="pd_importPandas" type="function" level="1" name="import" tag="판다스, IMPORT PANDAS">
+        <!-- <item id="pd_importPandas" type="function" level="1" name="import" tag="판다스, IMPORT PANDAS">
             <path>visualpython - pandas - import pandas</path>
             <desc>Import Pandas</desc>
             <file>pandas/import.js</file>
-        </item>        
+        </item>         -->
         <!-- plotting -->
         <item id="pd_plot" type="function" level="1" name="plot" tag="차트 그리기, PLOT, DRAW CHART FOR PANDAS, PLOT">
             <path>visualpython - pandas - plot</path>
diff --git a/src/api_block/blockContainer.js b/src/api_block/blockContainer.js
index 4988fd64..49fecbb1 100644
--- a/src/api_block/blockContainer.js
+++ b/src/api_block/blockContainer.js
@@ -285,6 +285,10 @@ define([
                     // re-render block header
                     var codeLineStr = block.getNowCodeLine();
                     block.writeCode(codeLineStr);
+                    this.resetBlockList();
+                    this.resetOptionPage();
+                    this.reRenderAllBlock_asc();
+
                 } else {
                     // blockList에 없으면, 삭제
                     block.deleteBlock_childBlockList();
@@ -349,6 +353,7 @@ define([
                     block.isModified = true;
                 } else {
                     $(VP_CLASS_PREFIX + 'vp-apiblock-option-new-to-save').css('display', 'none');
+                    block.isModified = false;
                 }
             }
         } else {
diff --git a/src/common/component/vpVarSelector.js b/src/common/component/vpVarSelector.js
index 17c3936d..ba189f25 100644
--- a/src/common/component/vpVarSelector.js
+++ b/src/common/component/vpVarSelector.js
@@ -131,10 +131,14 @@ define([
         // load using kernel
         var dataTypes = this.showOthers? []: this.dataTypes;
         kernelApi.searchVarList(dataTypes, function(result) {
-            var varList = JSON.parse(result);
-            that.state.varList = varList;
-            // render variable list
-            that.loadVariableList(varList);
+            try {
+                var varList = JSON.parse(result);
+                that.state.varList = varList;
+                // render variable list
+                that.loadVariableList(varList);
+            } catch (ex) {
+                console.log(ex);
+            }
         });
     }
 
diff --git a/src/common/vpSubsetEditor.js b/src/common/vpSubsetEditor.js
index 3351d051..6244a41c 100644
--- a/src/common/vpSubsetEditor.js
+++ b/src/common/vpSubsetEditor.js
@@ -150,28 +150,6 @@ define([
         this.bindEvent();
         this.init();
 
-        // set codemirror
-        this.codepreview = codemirror.fromTextArea($('#vp_previewCode')[0], {
-            mode: {
-                name: 'python',
-                version: 3,
-                singleLineStringErrors: false
-            },  // text-cell(markdown cell) set to 'htmlmixed'
-            height: '100%',
-            width: '100%',
-            indentUnit: 4,
-            matchBrackets: true,
-            readOnly:true,
-            autoRefresh: true,
-            // lineWrapping: false, // text-cell(markdown cell) set to true
-            // indentWithTabs: true,
-            theme: "ipython",
-            extraKeys: {"Enter": "newlineAndIndentContinueMarkdownList"},
-            scrollbarStyle: "null"
-        });
-        this.setPreview('# Code Preview');
-        
-
         // set readonly
         if (useInputVariable) {
             $(this.wrapSelector('.' + VP_DS_PANDAS_OBJECT)).attr('disabled', true);
@@ -384,7 +362,7 @@ define([
      * Wrap Selector for data selector popup with its uuid
      * @param {string} query 
      */
-    SubsetEditor.prototype.wrapSelector = function(query) {
+    SubsetEditor.prototype.wrapSelector = function(query = '') {
         return vpCommon.formatString('.{0}.{1} {2}', VP_DS, this.uuid, query);
     }
 
@@ -1644,17 +1622,46 @@ define([
      * open popup
      */
     SubsetEditor.prototype.open = function() {
+        if (!this.codepreview) {
+            // var previewTextarea = $('#vp_previewCode')[0];
+            var previewTextarea = $(this.wrapSelector('#vp_previewCode'))[0];
+            // if (wrappedTextarea) {
+            //     previewTextarea = wrappedTextarea;
+            // }
+            // set codemirror
+            this.codepreview = codemirror.fromTextArea(previewTextarea, {
+                mode: {
+                    name: 'python',
+                    version: 3,
+                    singleLineStringErrors: false
+                },  // text-cell(markdown cell) set to 'htmlmixed'
+                height: '100%',
+                width: '100%',
+                indentUnit: 4,
+                matchBrackets: true,
+                readOnly:true,
+                autoRefresh: true,
+                // lineWrapping: false, // text-cell(markdown cell) set to true
+                // indentWithTabs: true,
+                theme: "ipython",
+                extraKeys: {"Enter": "newlineAndIndentContinueMarkdownList"},
+                scrollbarStyle: "null"
+            });
+            this.setPreview('# Code Preview');
+        }
+        this.codepreview.refresh();
+
         // reload pandasObject on open
         this.loadVariables();
 
-        $(vpCommon.formatString(".{0}.{1}", VP_DS, this.uuid)).show();
+        $(this.wrapSelector()).show();
     }
 
     /**
      * close popup
      */
     SubsetEditor.prototype.close = function() {
-        $(vpCommon.formatString(".{0}.{1}", VP_DS, this.uuid)).hide();
+        $(this.wrapSelector()).hide();
     }
 
     SubsetEditor.prototype.hideButton = function() {
@@ -1908,12 +1915,14 @@ define([
     }
 
     SubsetEditor.prototype.setPreview = function(previewCodeStr) {
-        this.codepreview.setValue(previewCodeStr);
-        this.codepreview.save();
-        var that = this;
-        setTimeout(function() {
-            that.codepreview.refresh();
-        }, 1);
+        if (this.codepreview) {
+            this.codepreview.setValue(previewCodeStr);
+            this.codepreview.save();
+            var that = this;
+            setTimeout(function() {
+                that.codepreview.refresh();
+            }, 1);
+        }
     }
 
     return SubsetEditor