diff --git a/B05_Profile/B05_Profile_UI_Profile_Render.ts b/B05_Profile/B05_Profile_UI_Profile_Render.ts
index bbb001486..13880cf22 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Render.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Render.ts
@@ -294,6 +294,11 @@ export function renderProfile(ctx: ProfileRenderContext): void {
           ),
           selectedStationId,
           stationDisplay,
+          mcKeys: new Set(
+            (longitudinal.stations ?? [])
+              .filter((station) => station.kind === "curve")
+              .map((station) => station.chainage_m.toFixed(3)),
+          ),
           onCurveRadiusChange: (curve, radius) =>
             ctx.applyEdits(setCurveRadius(store.edits(), curve, radius ?? 0)),
           // 값 열 계획고 직접 입력 → 규칙 측점과 동일한 station_offset 파이프라인.
diff --git a/B05_Profile/B05_Profile_UI_Profile_Table.ts b/B05_Profile/B05_Profile_UI_Profile_Table.ts
index 3dd442f14..7f137d4b3 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Table.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Table.ts
@@ -43,6 +43,8 @@ export interface ProfileTableOptions {
   irregularStations?: IrregularStation[];
   /** 현재 선택된 측점 id. 규칙/비정규 측점 모두 그 측점의 값 열을 테이블에 겹쳐 보여준다. */
   selectedStationId?: string | null;
+  /** MC(곡선 가운데) 측점 누가거리(`toFixed(3)` 열쇠) — 측점 행에 「 (MC)」 · 크게 · 굵게 · 경고색(507-3 덧). */
+  mcKeys?: ReadonlySet<string>;
   /** 이어 공사 시작 기준 — 측점번호·누가거리 표시를 이만큼 더한다(내부 chainage는 0기준 유지). */
   stationDisplay?: { station: number; cumulative: number };
   onCurveRadiusChange: (curve: AlignmentCurve, radiusM: number | null) => void;
@@ -55,6 +57,8 @@ interface StationRowSpec {
   unit: string;
   cell: (index: number) => string;
   modifier?: string;
+  /** 측점 이름 행 — MC 열에 (MC) 강조. */
+  station?: boolean;
 }
 
 interface SegmentRowSpec {
@@ -208,6 +212,7 @@ function buildStationRows(
     {
       label: "측점",
       unit: "측점번호+잔여거리",
+      station: true,
       cell: (index) => displayStationLabel(stations[index].chainage_m, interval, display.station),
     },
   ];
@@ -458,6 +463,7 @@ function buildSelectedColumn(
   display: { station: number; cumulative: number },
   onAdjustStation?: (chainageM: number, deltaM: number) => void,
   isIrregular = false,
+  mc = false,
 ): HTMLElement {
   const plan = interpolateSample(alignment.samples, chainage, "elevation_m");
   const ground = interpolateSample(alignment.samples, chainage, "ground_elevation_m");
@@ -487,7 +493,12 @@ function buildSelectedColumn(
     { value: gradeCell((segment) => segment.grade_percent, 2), modifier: "grade" }, // 구배 S
     { value: { text: plan !== null ? plan.toFixed(2) : "" }, modifier: "plan", plan: true }, // 계획고
     { value: { text: ground !== null ? ground.toFixed(2) : "" }, modifier: "" }, // 지반고
-    { value: { text: displayStationLabel(chainage, interval, display.station) }, modifier: "" }, // 측점
+    {
+      value: {
+        text: displayStationLabel(chainage, interval, display.station) + (mc ? " (MC)" : ""),
+      },
+      modifier: mc ? "mc" : "",
+    }, // 측점
     { value: { text: curve ? curve.l_m.toFixed(2) : "" }, modifier: "" }, // 곡선 L
     { value: { text: curve ? curve.r_m.toFixed(1) : "" }, modifier: "" }, // 곡선 R
   ];
@@ -617,10 +628,13 @@ export function createProfileTable(options: ProfileTableOptions): HTMLElement {
     alignment.stations.forEach((_, stationIndex) => {
       // 구조물 측점 열은 기본값을 비운다 — 격자(빈 셀)만 남기고 값은 선택 오버레이가 맡는다.
       const structural = isStructural[stationIndex];
+      // MC 열 = 측점 행에 「 (MC)」 · 굵게 · 경고색(507-3 덧) — 칸 폭 판정(`longest`)은 옛 글 그대로
+      const mc =
+        spec.station && options.mcKeys?.has(alignment.stations[stationIndex].chainage_m.toFixed(3));
       const cell = element(
         "span",
-        `b05-profile-table__cell${structural ? " is-structure" : ""}`,
-        structural ? "" : spec.cell(stationIndex),
+        `b05-profile-table__cell${structural ? " is-structure" : ""}${mc ? " b06-station--mc" : ""}`,
+        structural ? "" : spec.cell(stationIndex) + (mc ? " (MC)" : ""),
       );
       const rotated = stationThickness[stationIndex];
       if (rotated !== null) {
@@ -649,6 +663,7 @@ export function createProfileTable(options: ProfileTableOptions): HTMLElement {
   // 선택된 측점(규칙·비정규 공용)을 **값 열 오버레이**로 강조한다.
   // 규칙 측점은 종점 이동을 반영한 `centers[index]`, 비정규 측점은 `x(chainage)`를 중심으로 쓴다.
   const selectedIrregular = selectedIrregularEntry;
+  const mcAt = (chainageM: number): boolean => options.mcKeys?.has(chainageM.toFixed(3)) ?? false;
   const selectedRegularIndex = selectedStationRow
     ? alignment.stations.indexOf(selectedStationRow)
     : -1;
@@ -665,6 +680,7 @@ export function createProfileTable(options: ProfileTableOptions): HTMLElement {
         display,
         options.onAdjustStation,
         true,
+        mcAt(selectedIrregular.chainage_m),
       ),
     );
   } else if (selectedRegularIndex >= 0) {
@@ -678,6 +694,7 @@ export function createProfileTable(options: ProfileTableOptions): HTMLElement {
         display,
         options.onAdjustStation,
         false,
+        mcAt(alignment.stations[selectedRegularIndex].chainage_m),
       ),
     );
   }
diff --git a/B05_Profile/B05_Profile_UI_Style_Table.css b/B05_Profile/B05_Profile_UI_Style_Table.css
index 6860b155a..51be9fe46 100644
--- a/B05_Profile/B05_Profile_UI_Style_Table.css
+++ b/B05_Profile/B05_Profile_UI_Style_Table.css
@@ -288,6 +288,12 @@
   color: rgb(37 99 235);
 }
 
+/* MC 측점 이름(507-3 덧) — 굵게 · 경고색 */
+.b05-profile-table__irregular-col-cell.is-mc {
+  color: var(--color-warning);
+  font-weight: var(--font-weight-bold);
+}
+
 /* 계획고(is-plan)는 오버레이에서 별도 강조 없이 다른 값과 동일한 스타일을 쓴다(작업 C-2). */
 
 /* 값 열의 계획고 직접 입력 셀 — 열은 pointer-events:none이라 입력만 되살린다. */
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support.py b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
index 1f61b6729..17e9e38f8 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
@@ -221,6 +221,7 @@ def _drawing_list(project_root: Path, longitudinal_path: Path) -> list[DesignDra
         chainages = sheet["chainages"]
         first = station_by_chainage.get(chainages[0], {})
         station = station_no_label(float(first.get("chainage_m", chainages[0])), interval)
+        station += mc_suffix(first)
         drawings.append(
             DesignDrawingItem(
                 id=sheet["id"],
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support_Plan.py b/B07_DesignDetail/B07_DesignDetail_Router_Support_Plan.py
index 44c539b14..1905ec8da 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support_Plan.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support_Plan.py
@@ -25,7 +25,11 @@ from B05_Profile.B05_Profile_Engine_Sections import (
 )
 from B05_Profile.B05_Profile_Structures_Repository import load_structures
 from B06_Section.B06_Section_Engine_Design import compute_cross_design, curve_widening_args
-from B07_DesignDetail.B07_DesignDetail_Engine_Cad import infer_station_interval, station_no_label
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad import (
+    infer_station_interval,
+    mc_suffix,
+    station_no_label,
+)
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_IpTable import clip_lines, ip_table_piece
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Plan import (
     _structure_label,
@@ -502,6 +506,11 @@ def build_pieces(
         pieces["ip"], pieces["radius"] = curve_pieces(_load_design_curves(project_root), route, box)
     if "station" in wanted:
         items = []
+        curve_at = {
+            float(item["chainage_m"])
+            for item in longitudinal.get("stations") or []
+            if mc_suffix(item) and isinstance(item.get("chainage_m"), (int, float))
+        }
         for chainage, x, y in stations:
             if not (start_m <= chainage <= end_m):
                 continue
@@ -509,6 +518,8 @@ def build_pieces(
             label = station_no_label(chainage, interval).replace("No.", "NO.")
             number_only = "+" not in label
             major = number_only and int(label[3:]) % 5 == 0
+            if chainage in curve_at:  # MC = 고칠 자리(507-3) — 5 배수가 아니어도 글 · 큰 글(major)
+                label, major = label + " (MC)", True
             items.append(
                 {
                     "chainage_m": chainage,
diff --git a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
index 7f805e943..5366a0934 100644
--- a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
+++ b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
@@ -178,7 +178,10 @@ export function buildDrawingSidePanel(
     }
     for (const drawing of items) {
       // 횡단면도는 장 단위(여러 측점)라 서버가 준 "N장 (구간)" 라벨을 그대로 쓴다.
-      section.append(drawingButton(drawing, drawing.label));
+      const button = drawingButton(drawing, drawing.label);
+      // 이름 뒤 「 (MC)」(507-3 덧) — 한 칸에 안 들어가 두 열을 가로지름
+      if (drawing.label.includes("(MC)")) button.dataset.mc = "true";
+      section.append(button);
     }
     if (structure && items.length === 0) {
       const empty = document.createElement("p");
diff --git a/B07_DesignDetail/B07_DesignDetail_UI_Style.css b/B07_DesignDetail/B07_DesignDetail_UI_Style.css
index 08a7af3f9..552deb3d5 100644
--- a/B07_DesignDetail/B07_DesignDetail_UI_Style.css
+++ b/B07_DesignDetail/B07_DesignDetail_UI_Style.css
@@ -70,6 +70,11 @@
   grid-column: 1 / -1;
 }
 
+/* MC 장 단추(507-3 덧) — 이름이 길어 한 줄 전체 */
+.b07-drawing-group[data-kind="cross"] .b07-drawing-button[data-mc="true"] {
+  grid-column: 1 / -1;
+}
+
 .b07-drawing-button {
   display: flex;
   align-items: center;
diff --git a/resources/tester/test_507_3_mc_label.py b/resources/tester/test_507_3_mc_label.py
index da93b8ca6..02b8d94ca 100644
--- a/resources/tester/test_507_3_mc_label.py
+++ b/resources/tester/test_507_3_mc_label.py
@@ -87,3 +87,39 @@ def test_b05_b06_screen_mc_emphasis() -> None:
     assert 'themeColor("--color-warning"' in ticks
     swap = _src("B06_Section/logic/B06_Section_Station_Swap.ts")
     assert 'formatStation(station.chainageM) + (kind === "curve" ? " (MC)" : "")' in swap
+
+
+def test_b07_plan_station_mc_label() -> None:
+    """계획평면도 측점 글 = 5 배수만이었음 → MC 도 큰 글(major) + (MC)."""
+    plan = _src("B07_DesignDetail/B07_DesignDetail_Router_Support_Plan.py")
+    assert 'label, major = label + " (MC)", True' in plan
+    assert "if mc_suffix(item)" in plan  # 종단 kind curve 측점만
+
+
+def test_b07_sheet_button_mc() -> None:
+    """B07 횡단 장 단추 「3장 (No.29+19.0 (MC))」 — 그 장 첫 측점이 MC 일 때."""
+    support = _src("B07_DesignDetail/B07_DesignDetail_Router_Support.py")
+    assert "station += mc_suffix(first)" in support
+    assert "label=f\"{sheet['number']}장 ({station})\"" in support
+
+
+def test_b05_profile_table_station_mc() -> None:
+    table = _src("B05_Profile/B05_Profile_UI_Profile_Table.ts")
+    # 칸 글 · 굵게 · 경고색 = B06 공용 규칙 · 칸 폭 판정(`longest`)은 (MC) 없는 글 그대로
+    assert 'spec.cell(stationIndex) + (mc ? " (MC)" : "")' in table
+    assert '${mc ? " b06-station--mc" : ""}' in table
+    assert 'display.station) + (mc ? " (MC)" : "")' in table  # 고른 측점 값 열
+    render = _src("B05_Profile/B05_Profile_UI_Profile_Render.ts")
+    assert 'station.kind === "curve"' in render
+    css = _src("B05_Profile/B05_Profile_UI_Style_Table.css")
+    body = css[css.index("__irregular-col-cell.is-mc {") : css.index("}", css.index(".is-mc {"))]
+    assert "var(--color-warning)" in body
+    assert "var(--font-weight-bold)" in body
+
+
+def test_b07_sheet_button_spans_row() -> None:
+    panels = _src("B07_DesignDetail/B07_DesignDetail_UI_Panels.ts")
+    assert 'button.dataset.mc = "true"' in panels
+    css = _src("B07_DesignDetail/B07_DesignDetail_UI_Style.css")
+    rule = css[css.index('.b07-drawing-button[data-mc="true"] {') :]
+    assert "grid-column: 1 / -1" in rule[: rule.index("}")]