diff --git a/frontend/components/dataflow/connection/SimpleKeySettings.tsx b/frontend/components/dataflow/connection/SimpleKeySettings.tsx
index 57b5dd91..a1c34f34 100644
--- a/frontend/components/dataflow/connection/SimpleKeySettings.tsx
+++ b/frontend/components/dataflow/connection/SimpleKeySettings.tsx
@@ -132,11 +132,15 @@ export const SimpleKeySettings: React.FC<SimpleKeySettingsProps> = ({
               <Label className="text-xs font-medium text-gray-600">선택된 From 컬럼</Label>
               <div className="mt-1 flex flex-wrap gap-1">
                 {selectedFromColumns.length > 0 ? (
-                  selectedFromColumns.map((column) => (
-                    <Badge key={column} variant="outline" className="text-xs">
-                      {column}
-                    </Badge>
-                  ))
+                  selectedFromColumns.map((column) => {
+                    const columnInfo = fromTableColumns.find((col) => col.columnName === column);
+                    const displayName = columnInfo?.displayName || columnInfo?.columnLabel || column;
+                    return (
+                      <Badge key={column} variant="outline" className="text-xs">
+                        {displayName}
+                      </Badge>
+                    );
+                  })
                 ) : (
                   <span className="text-xs text-gray-400">선택된 컬럼 없음</span>
                 )}
@@ -147,11 +151,15 @@ export const SimpleKeySettings: React.FC<SimpleKeySettingsProps> = ({
               <Label className="text-xs font-medium text-gray-600">선택된 To 컬럼</Label>
               <div className="mt-1 flex flex-wrap gap-1">
                 {selectedToColumns.length > 0 ? (
-                  selectedToColumns.map((column) => (
-                    <Badge key={column} variant="secondary" className="text-xs">
-                      {column}
-                    </Badge>
-                  ))
+                  selectedToColumns.map((column) => {
+                    const columnInfo = toTableColumns.find((col) => col.columnName === column);
+                    const displayName = columnInfo?.displayName || columnInfo?.columnLabel || column;
+                    return (
+                      <Badge key={column} variant="secondary" className="text-xs">
+                        {displayName}
+                      </Badge>
+                    );
+                  })
                 ) : (
                   <span className="text-xs text-gray-400">선택된 컬럼 없음</span>
                 )}