diff --git a/src/features/editor/utils/formHelpers.ts b/src/features/editor/utils/formHelpers.ts
index e7fb173..11e2330 100644
--- a/src/features/editor/utils/formHelpers.ts
+++ b/src/features/editor/utils/formHelpers.ts
@@ -925,11 +925,15 @@ export const computeFormControllerPublicTokens = (
   );
   const mappedSubmitLabel = (mappedSubmitButton?.props as ButtonBlockProps | undefined)?.label ?? null;
 
-  // FormBlock 은 레이아웃/스타일을 가지지 않는 순수 컨트롤러이므로
-  // formClassName 은 고정 기본값만 사용하고, formStyle 은 항상 빈 객체로 유지한다.
+  // FormBlock 은 레이아웃/스타일을 가지지 않는 순수 컨트롤러이지만,
+  // 배경색 커스텀 값을 허용해 form 요소 배경만 제어할 수 있도록 한다.
   const formClassNames = ["space-y-3"];
   const formStyle: CSSProperties = {};
 
+  if (props.backgroundColorCustom && props.backgroundColorCustom.trim() !== "") {
+    formStyle.backgroundColor = props.backgroundColorCustom.trim();
+  }
+
   return {
     fields,
     formClassName: formClassNames.join(" "),
diff --git a/tests/unit/PublicPageRendererBlockBackground.spec.tsx b/tests/unit/PublicPageRendererBlockBackground.spec.tsx
index 9314d22..eee9088 100644
--- a/tests/unit/PublicPageRendererBlockBackground.spec.tsx
+++ b/tests/unit/PublicPageRendererBlockBackground.spec.tsx
@@ -88,7 +88,7 @@ describe("PublicPageRenderer - 블록 배경색", () => {
     expect(listNoBg!.style.backgroundColor === "" || listNoBg!.style.backgroundColor === "transparent").toBe(true);
   });
 
-  it("form 컨트롤러 블록은 프리뷰에서 별도 폼 래퍼를 렌더하지 않아야 한다", () => {
+  it("form 컨트롤러 블록은 backgroundColorCustom 이 설정된 경우에만 폼 요소에 배경색을 적용해야 한다", () => {
     const blocksWithBg: Block[] = [
       {
         id: "form_with_bg",
@@ -107,8 +107,10 @@ describe("PublicPageRenderer - 블록 배경색", () => {
 
     const { queryByTestId, rerender } = render(<PublicPageRenderer blocks={blocksWithBg} />);
 
-    const formWithBg = queryByTestId("preview-form-controller");
-    expect(formWithBg).toBeNull();
+    const formWithBg = queryByTestId("preview-form-controller") as HTMLElement | null;
+    expect(formWithBg).not.toBeNull();
+    // JSDOM 은 #111111 을 rgb(17, 17, 17) 형태로 노출한다.
+    expect(formWithBg!.style.backgroundColor).toBe("rgb(17, 17, 17)");
 
     const blocksWithoutBg: Block[] = [
       {
@@ -126,8 +128,11 @@ describe("PublicPageRenderer - 블록 배경색", () => {
 
     rerender(<PublicPageRenderer blocks={blocksWithoutBg} />);
 
-    const formNoBg = queryByTestId("preview-form-controller");
-    expect(formNoBg).toBeNull();
+    const formNoBg = queryByTestId("preview-form-controller") as HTMLElement | null;
+    expect(formNoBg).not.toBeNull();
+    expect(
+      formNoBg!.style.backgroundColor === "" || formNoBg!.style.backgroundColor === "transparent",
+    ).toBe(true);
   });
 
   it("section 블록은 backgroundColorCustom 이 설정된 경우에만 섹션 요소에 배경색이 적용되어야 한다", () => {
diff --git a/tests/unit/PublicPageRendererFormSubmitMessages.spec.tsx b/tests/unit/PublicPageRendererFormSubmitMessages.spec.tsx
index 4244974..12eb399 100644
--- a/tests/unit/PublicPageRendererFormSubmitMessages.spec.tsx
+++ b/tests/unit/PublicPageRendererFormSubmitMessages.spec.tsx
@@ -12,10 +12,10 @@ describe("PublicPageRenderer - 폼 제출 메시지", () => {
     cleanup();
     // fetch 목 초기화
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    (global as any).fetch = undefined;
+    (globalThis as any).fetch = undefined;
   });
 
-  it("FormBlock 이 있어도 프리뷰에서는 폼 컨트롤러를 렌더하지 않아야 한다 (성공 메시지 설정)", () => {
+  it("성공 응답 시 FormBlock 의 successMessage 를 성공 메시지로 렌더해야 한다", async () => {
     const blocks: Block[] = [
       {
         id: "form_success",
@@ -25,6 +25,9 @@ describe("PublicPageRenderer - 폼 제출 메시지", () => {
           submitTarget: "internal",
           successMessage: "폼 성공 메시지 (config)",
           errorMessage: "폼 에러 메시지 (config)",
+          fields: [
+            { id: "f1", name: "name", label: "이름", type: "text", required: true },
+          ],
           fieldIds: [],
           submitButtonId: null,
         } as any,
@@ -38,16 +41,32 @@ describe("PublicPageRenderer - 폼 제출 메시지", () => {
       }),
     );
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    (global as any).fetch = fetchMock;
+    (globalThis as any).fetch = fetchMock;
 
     render(<PublicPageRenderer blocks={blocks} />);
 
-    const form = screen.queryByTestId("preview-form-controller");
-    expect(form).toBeNull();
-    expect(fetchMock).not.toHaveBeenCalled();
+    const form = screen.getByTestId("preview-form-controller") as HTMLFormElement;
+    expect(form).toBeTruthy();
+
+    const input = form.querySelector('input[name="name"]') as HTMLInputElement | null;
+    expect(input).not.toBeNull();
+
+    const submitButton = screen.getByRole("button", { name: "폼 전송" });
+    expect(submitButton).toBeTruthy();
+
+    fireEvent.submit(form);
+
+    await waitFor(() => {
+      expect(fetchMock).toHaveBeenCalledTimes(1);
+    });
+
+    await waitFor(() => {
+      const msg = screen.getByText("폼 성공 메시지 (config)");
+      expect(msg).toBeTruthy();
+    });
   });
 
-  it("FormBlock 이 있어도 프리뷰에서는 폼 컨트롤러나 에러 메시지를 렌더하지 않아야 한다", () => {
+  it("실패 응답 시 FormBlock 의 errorMessage 를 에러 메시지로 렌더해야 한다", async () => {
     const blocks: Block[] = [
       {
         id: "form_error",
@@ -57,6 +76,9 @@ describe("PublicPageRenderer - 폼 제출 메시지", () => {
           submitTarget: "internal",
           successMessage: "폼 성공 메시지 (config)",
           errorMessage: "폼 에러 메시지 (config)",
+          fields: [
+            { id: "f1", name: "name", label: "이름", type: "text", required: true },
+          ],
           fieldIds: [],
           submitButtonId: null,
         } as any,
@@ -70,13 +92,25 @@ describe("PublicPageRenderer - 폼 제출 메시지", () => {
       }),
     );
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    (global as any).fetch = fetchMock;
+    (globalThis as any).fetch = fetchMock;
 
     render(<PublicPageRenderer blocks={blocks} />);
 
-    const form = screen.queryByTestId("preview-form-controller");
-    expect(form).toBeNull();
-    expect(fetchMock).not.toHaveBeenCalled();
-    expect(screen.queryByText("폼 에러 메시지 (config)")).toBeNull();
+    const form = screen.getByTestId("preview-form-controller") as HTMLFormElement;
+    expect(form).toBeTruthy();
+
+    const submitButton = screen.getByRole("button", { name: "폼 전송" });
+    expect(submitButton).toBeTruthy();
+
+    fireEvent.submit(form);
+
+    await waitFor(() => {
+      expect(fetchMock).toHaveBeenCalledTimes(1);
+    });
+
+    await waitFor(() => {
+      const errorMsg = screen.getByText("폼 에러 메시지 (config)");
+      expect(errorMsg).toBeTruthy();
+    });
   });
 });
diff --git a/tests/unit/formHelpers.spec.ts b/tests/unit/formHelpers.spec.ts
index 73e68f4..2a996a8 100644
--- a/tests/unit/formHelpers.spec.ts
+++ b/tests/unit/formHelpers.spec.ts
@@ -467,9 +467,8 @@ describe("formHelpers.computeFormControllerPublicTokens", () => {
 		expect(checkboxField.groupLabelImageUrl).toBe("https://example.com/group.png");
 
 		expect(tokens.formClassName).toBe("space-y-3");
-		// FormBlock 은 이제 레이아웃/배경 스타일을 가지지 않는 순수 컨트롤러이므로,
-		// formStyle 은 항상 빈 객체여야 한다.
-		expect(tokens.formStyle).toEqual({});
+		// FormBlock 은 레이아웃 정보는 가지지 않지만, backgroundColorCustom 으로 폼 래퍼 배경색만 제어할 수 있다.
+		expect(tokens.formStyle).toEqual({ backgroundColor: "#123456" });
 
 		expect(tokens.submitLabel).toBe("컨트롤러 버튼");
 	});
diff --git a/uploads/20b557a2-e4e8-4682-aa9b-bcb1cb23506d b/uploads/20b557a2-e4e8-4682-aa9b-bcb1cb23506d
new file mode 100644
index 0000000..87ccacf
--- /dev/null
+++ b/uploads/20b557a2-e4e8-4682-aa9b-bcb1cb23506d
@@ -0,0 +1 @@
+dummy-video
\ No newline at end of file
diff --git a/uploads/4205a274-0ee6-443d-963f-4714e64b9c06 b/uploads/4205a274-0ee6-443d-963f-4714e64b9c06
new file mode 100644
index 0000000..87ccacf
--- /dev/null
+++ b/uploads/4205a274-0ee6-443d-963f-4714e64b9c06
@@ -0,0 +1 @@
+dummy-video
\ No newline at end of file
diff --git a/uploads/test-image-1764642023862 b/uploads/test-image-1764642023862
new file mode 100644
index 0000000..0cc5db2
--- /dev/null
+++ b/uploads/test-image-1764642023862
@@ -0,0 +1 @@
+dummy-image
\ No newline at end of file
diff --git a/uploads/test-image-1764642096038 b/uploads/test-image-1764642096038
new file mode 100644
index 0000000..0cc5db2
--- /dev/null
+++ b/uploads/test-image-1764642096038
@@ -0,0 +1 @@
+dummy-image
\ No newline at end of file
diff --git a/uploads/test-section-bg-1764642023931 b/uploads/test-section-bg-1764642023931
new file mode 100644
index 0000000..0cc5db2
--- /dev/null
+++ b/uploads/test-section-bg-1764642023931
@@ -0,0 +1 @@
+dummy-image
\ No newline at end of file
diff --git a/uploads/test-section-bg-1764642096099 b/uploads/test-section-bg-1764642096099
new file mode 100644
index 0000000..0cc5db2
--- /dev/null
+++ b/uploads/test-section-bg-1764642096099
@@ -0,0 +1 @@
+dummy-image
\ No newline at end of file
diff --git a/uploads/test-section-bg-video-1764642023995 b/uploads/test-section-bg-video-1764642023995
new file mode 100644
index 0000000..badc796
--- /dev/null
+++ b/uploads/test-section-bg-video-1764642023995
@@ -0,0 +1 @@
+dummy-section-video
\ No newline at end of file
diff --git a/uploads/test-section-bg-video-1764642096131 b/uploads/test-section-bg-video-1764642096131
new file mode 100644
index 0000000..badc796
--- /dev/null
+++ b/uploads/test-section-bg-video-1764642096131
@@ -0,0 +1 @@
+dummy-section-video
\ No newline at end of file
diff --git a/uploads/test-video-1764642023985 b/uploads/test-video-1764642023985
new file mode 100644
index 0000000..87ccacf
--- /dev/null
+++ b/uploads/test-video-1764642023985
@@ -0,0 +1 @@
+dummy-video
\ No newline at end of file
diff --git a/uploads/test-video-1764642096117 b/uploads/test-video-1764642096117
new file mode 100644
index 0000000..87ccacf
--- /dev/null
+++ b/uploads/test-video-1764642096117
@@ -0,0 +1 @@
+dummy-video
\ No newline at end of file
diff --git a/uploads/test-video-poster-1764642023903 b/uploads/test-video-poster-1764642023903
new file mode 100644
index 0000000..7285c92
--- /dev/null
+++ b/uploads/test-video-poster-1764642023903
@@ -0,0 +1 @@
+dummy-poster
\ No newline at end of file
diff --git a/uploads/test-video-poster-1764642096084 b/uploads/test-video-poster-1764642096084
new file mode 100644
index 0000000..7285c92
--- /dev/null
+++ b/uploads/test-video-poster-1764642096084
@@ -0,0 +1 @@
+dummy-poster
\ No newline at end of file