diff --git a/backend-node/src/routes/dataRoutes.ts b/backend-node/src/routes/dataRoutes.ts
index fb0f1518..33413da3 100644
--- a/backend-node/src/routes/dataRoutes.ts
+++ b/backend-node/src/routes/dataRoutes.ts
@@ -51,21 +51,26 @@ router.get(
         }
       }
 
+      // 회사 코드 추출 (멀티테넌시 필터링)
+      const userCompany = req.user?.companyCode;
+
       console.log(`🔗 조인 데이터 조회:`, {
         leftTable,
         rightTable,
         leftColumn,
         rightColumn,
         leftValue,
+        userCompany,
       });
 
-      // 조인 데이터 조회
+      // 조인 데이터 조회 (회사 코드 전달)
       const result = await dataService.getJoinedData(
         leftTable as string,
         rightTable as string,
         leftColumn as string,
         rightColumn as string,
-        leftValue as string
+        leftValue as string,
+        userCompany
       );
 
       if (!result.success) {
diff --git a/backend-node/src/services/dataService.ts b/backend-node/src/services/dataService.ts
index 462ebb4d..eb69797e 100644
--- a/backend-node/src/services/dataService.ts
+++ b/backend-node/src/services/dataService.ts
@@ -409,7 +409,8 @@ class DataService {
     rightTable: string,
     leftColumn: string,
     rightColumn: string,
-    leftValue?: string | number
+    leftValue?: string | number,
+    userCompany?: string
   ): Promise<ServiceResponse<any[]>> {
     try {
       // 왼쪽 테이블 접근 검증
@@ -425,18 +426,42 @@ class DataService {
       }
 
       let queryText = `
-        SELECT r.* 
+        SELECT DISTINCT r.* 
         FROM "${rightTable}" r
         INNER JOIN "${leftTable}" l 
         ON l."${leftColumn}" = r."${rightColumn}"
       `;
 
       const values: any[] = [];
+      const whereConditions: string[] = [];
+      let paramIndex = 1;
+
+      // 좌측 값 필터링
       if (leftValue !== undefined && leftValue !== null) {
-        queryText += ` WHERE l."${leftColumn}" = $1`;
+        whereConditions.push(`l."${leftColumn}" = $${paramIndex}`);
         values.push(leftValue);
+        paramIndex++;
       }
 
+      // 우측 테이블 회사별 필터링 (company_code 컬럼이 있는 경우)
+      if (userCompany && userCompany !== "*") {
+        const hasCompanyCode = await this.checkColumnExists(rightTable, "company_code");
+        if (hasCompanyCode) {
+          whereConditions.push(`r.company_code = $${paramIndex}`);
+          values.push(userCompany);
+          paramIndex++;
+          console.log(`🏢 우측 패널 회사별 필터링 적용: ${rightTable}.company_code = ${userCompany}`);
+        }
+      }
+
+      // WHERE 절 추가
+      if (whereConditions.length > 0) {
+        queryText += ` WHERE ${whereConditions.join(" AND ")}`;
+      }
+
+      console.log("🔍 조인 쿼리 실행:", queryText);
+      console.log("📊 조인 쿼리 파라미터:", values);
+
       const result = await query<any>(queryText, values);
 
       return {
diff --git a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
index 3da7ce27..0d6dfbd9 100644
--- a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
+++ b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
@@ -373,10 +373,56 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
                       const itemId = item.id || item.ID || item[Object.keys(item)[0]] || index;
                       const isSelected =
                         selectedLeftItem && (selectedLeftItem.id === itemId || selectedLeftItem === item);
-                      // 첫 번째 2-3개 필드를 표시
-                      const keys = Object.keys(item).filter((k) => k !== "id" && k !== "ID");
-                      const displayTitle = item[keys[0]] || item.name || item.title || `항목 ${index + 1}`;
-                      const displaySubtitle = keys[1] ? item[keys[1]] : null;
+
+                      // 조인에 사용하는 leftColumn을 필수로 표시
+                      const leftColumn = componentConfig.rightPanel?.relation?.leftColumn;
+                      let displayFields: { label: string; value: any }[] = [];
+
+                      // 디버그 로그
+                      if (index === 0) {
+                        console.log("🔍 좌측 패널 표시 로직:");
+                        console.log("  - leftColumn (조인 키):", leftColumn);
+                        console.log("  - item keys:", Object.keys(item));
+                      }
+
+                      if (leftColumn) {
+                        // 조인 모드: leftColumn 값을 첫 번째로 표시 (필수)
+                        displayFields.push({
+                          label: leftColumn,
+                          value: item[leftColumn],
+                        });
+
+                        // 추가로 다른 의미있는 필드 1-2개 표시 (name, title 등)
+                        const additionalKeys = Object.keys(item).filter(
+                          (k) => k !== "id" && k !== "ID" && k !== leftColumn && 
+                                 (k.includes("name") || k.includes("title") || k.includes("desc"))
+                        );
+                        
+                        if (additionalKeys.length > 0) {
+                          displayFields.push({
+                            label: additionalKeys[0],
+                            value: item[additionalKeys[0]],
+                          });
+                        }
+
+                        if (index === 0) {
+                          console.log("  ✅ 조인 키 기반 표시:", displayFields);
+                        }
+                      } else {
+                        // 상세 모드 또는 설정 없음: 자동으로 첫 2개 필드 표시
+                        const keys = Object.keys(item).filter((k) => k !== "id" && k !== "ID");
+                        displayFields = keys.slice(0, 2).map((key) => ({
+                          label: key,
+                          value: item[key],
+                        }));
+
+                        if (index === 0) {
+                          console.log("  ⚠️ 조인 키 없음, 자동 선택:", displayFields);
+                        }
+                      }
+
+                      const displayTitle = displayFields[0]?.value || item.name || item.title || `항목 ${index + 1}`;
+                      const displaySubtitle = displayFields[1]?.value || null;
 
                       return (
                         <div
diff --git a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutConfigPanel.tsx b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutConfigPanel.tsx
index d53d90e9..0575efed 100644
--- a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutConfigPanel.tsx
+++ b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutConfigPanel.tsx
@@ -268,6 +268,7 @@ export const SplitPanelLayoutConfigPanel: React.FC<SplitPanelLayoutConfigPanelPr
             onCheckedChange={(checked) => updateLeftPanel({ showAdd: checked })}
           />
         </div>
+
       </div>
 
       {/* 우측 패널 설정 */}