diff --git a/src/hooks/roofcover/useEavesGableEdit.js b/src/hooks/roofcover/useEavesGableEdit.js
index 7b5b5f40..eb0938d7 100644
--- a/src/hooks/roofcover/useEavesGableEdit.js
+++ b/src/hooks/roofcover/useEavesGableEdit.js
@@ -364,8 +364,12 @@ export function useEavesGableEdit(id) {
           }
         }
         const labelOf = (line) => (line ? labelByLine.get(line) || '?' : null)
-        const t1 = { x: target.x1, y: target.y1 }
-        const t2 = { x: target.x2, y: target.y2 }
+        // [KERAB-WLINE-T1T2 2026-06-04] wLine 이동 후 선택된 target 은 이동 전 wallLine.
+        //   이동된 실제 위치는 wall.baseLines 중 wallId 가 일치하는 baseLine 에 있다.
+        const _wall = canvas.getObjects().find((o) => o.name === POLYGON_TYPE.WALL && o.attributes?.roofId === target.attributes?.roofId)
+        const _matchedBase = _wall?.baseLines?.find((bl) => bl.attributes?.wallId === target.attributes?.wallId)
+        const t1 = _matchedBase ? { x: _matchedBase.x1, y: _matchedBase.y1 } : { x: target.x1, y: target.y1 }
+        const t2 = _matchedBase ? { x: _matchedBase.x2, y: _matchedBase.y2 } : { x: target.x2, y: target.y2 }
         const h1Match = findHipAtEndpoint(roof, t1)
         const h2Match = findHipAtEndpoint(roof, t2)
         logger.log(
@@ -734,11 +738,13 @@ export function useEavesGableEdit(id) {
                 return Math.abs((vax * vbx + vay * vby) / (ma * mb)) < PERP_EPS
               }
               const computePendingKLine = (apex) => {
-                const ax = h2Match.near.x - h1Match.near.x
-                const ay = h2Match.near.y - h1Match.near.y
+                // [KERAB-WLINE-T1T2 2026-06-04] wLine 이동 후 hip.near 가 target 끝점에서 벗어나므로
+                // 이동한 처마라인 끝점(t1/t2) 기준으로 foot 계산
+                const ax = t2.x - t1.x
+                const ay = t2.y - t1.y
                 const aSq = ax * ax + ay * ay || 1
-                const tFoot = ((apex.x - h1Match.near.x) * ax + (apex.y - h1Match.near.y) * ay) / aSq
-                const foot = { x: h1Match.near.x + tFoot * ax, y: h1Match.near.y + tFoot * ay }
+                const tFoot = ((apex.x - t1.x) * ax + (apex.y - t1.y) * ay) / aSq
+                const foot = { x: t1.x + tFoot * ax, y: t1.y + tFoot * ay }
                 return { x1: apex.x, y1: apex.y, x2: foot.x, y2: foot.y }
               }
               const pushApexIfNew = (point, callerTag = '?') => {
@@ -1492,8 +1498,8 @@ export function useEavesGableEdit(id) {
                   roof,
                   target,
                   markerApex,
-                  h1Match.near,
-                  h2Match.near,
+                  t1,
+                  t2,
                   [h1Match.hip, h2Match.hip, ...pathHips],
                   pathRidges,
                   extLines,
@@ -2160,8 +2166,8 @@ export function useEavesGableEdit(id) {
               roof,
               target,
               apex,
-              h1Match.near,
-              h2Match.near,
+              t1,
+              t2,
               [h1Match.hip, h2Match.hip],
               null,
               null,