diff --git a/scripts/verify-release-candidate.mjs b/scripts/verify-release-candidate.mjs
index df38566..e485b01 100644
--- a/scripts/verify-release-candidate.mjs
+++ b/scripts/verify-release-candidate.mjs
@@ -399,18 +399,110 @@ try {
     `Expected all 23 campaign officers to use loaded lightweight portrait cards: ${JSON.stringify(missingMidFormationPortraits)}`
   );
 
-  await page.mouse.move(530, 260);
-  await page.waitForFunction(() => Boolean(window.__HEROS_DEBUG__?.camp()?.sortieHoveredUnitId), undefined, { timeout: 30000 });
-  const hoveredPortraitUnitId = await page.evaluate(() => window.__HEROS_DEBUG__?.camp()?.sortieHoveredUnitId);
+  const midFormationSelectedBefore = [...(midFormationPortraitState?.selectedSortieUnitIds ?? [])];
+  const midFormationCampaignSelectedBefore = [...(midFormationPortraitState?.campaign?.selectedSortieUnitIds ?? [])];
+  await page.mouse.click(210, 447);
+  await page.waitForFunction(() => window.__HEROS_DEBUG__?.camp()?.sortieFocusedUnitId === 'ma-dai', undefined, { timeout: 30000 });
+  const swapFocusState = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
+  assert(
+    JSON.stringify(swapFocusState?.selectedSortieUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(swapFocusState?.campaign?.selectedSortieUnitIds) === JSON.stringify(midFormationCampaignSelectedBefore),
+    `Expected focusing Ma Dai to preserve the actual sortie roster: ${JSON.stringify(swapFocusState?.selectedSortieUnitIds)}`
+  );
+
+  await page.mouse.move(530, 544);
+  await page.waitForFunction(() => {
+    const state = window.__HEROS_DEBUG__?.camp();
+    return state?.sortieHoveredUnitId === 'guan-yu' && state?.sortieComparisonPreview?.source === 'hover-swap';
+  }, undefined, { timeout: 30000 });
+  const midFormationSwapPreviewProbe = await page.evaluate(() => {
+    const scene = window.__HEROS_GAME__?.scene.getScene('CampScene');
+    const view = scene?.sortieComparisonPanelView;
+    return {
+      state: window.__HEROS_DEBUG__?.camp(),
+      panel: {
+        title: view?.title?.text ?? null,
+        headline: view?.headline?.text ?? null,
+        impact: view?.impact?.text ?? null,
+        detail: view?.detail?.text ?? null
+      }
+    };
+  });
+  const midFormationSwapPreviewState = midFormationSwapPreviewProbe.state;
+  const swapPreview = midFormationSwapPreviewState?.sortieComparisonPreview;
+  const expectedProjectedSwapIds = midFormationSelectedBefore.map((unitId) => unitId === 'ma-dai' ? 'guan-yu' : unitId);
   assert(
     midFormationPortraitState.sortiePortraitRoster.some(
-      (unit) => unit.id === hoveredPortraitUnitId && unit.portraitReady && unit.portraitTextureKey?.startsWith('portrait-card-')
+      (unit) => unit.id === swapPreview?.incomingUnitId && unit.portraitReady && unit.portraitTextureKey?.startsWith('portrait-card-')
     ),
-    `Expected portrait-card hover feedback for a mapped officer: ${JSON.stringify(hoveredPortraitUnitId)}`
+    `Expected portrait-card hover feedback for a mapped swap candidate: ${JSON.stringify(swapPreview?.incomingUnitId)}`
+  );
+  assert(
+      swapPreview?.mode === 'swap' &&
+      swapPreview?.incomingUnitId === 'guan-yu' &&
+      swapPreview?.outgoingUnitId === 'ma-dai' &&
+      JSON.stringify(swapPreview?.selectedUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(swapPreview?.projectedSelectedUnitIds) === JSON.stringify(expectedProjectedSwapIds) &&
+      JSON.stringify(swapPreview?.current?.selectedUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(swapPreview?.projected?.selectedUnitIds) === JSON.stringify(expectedProjectedSwapIds) &&
+      JSON.stringify(swapPreview?.comparison?.current?.selectedUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(swapPreview?.comparison?.projected?.selectedUnitIds) === JSON.stringify(expectedProjectedSwapIds) &&
+      swapPreview?.metrics?.length === 4 &&
+      swapPreview.metrics.some((metric) => metric.delta !== 0) &&
+      swapPreview?.comparison?.lostRoles?.includes('flank') &&
+      swapPreview?.comparison?.activeBondDelta === 0 &&
+      swapPreview?.comparison?.gainedBonds?.length > 0 &&
+      swapPreview?.comparison?.lostBonds?.length > 0,
+    `Expected a meaningful non-destructive Ma Dai to Guan Yu swap preview: ${JSON.stringify(swapPreview)}`
+  );
+  assert(
+    midFormationSwapPreviewProbe.panel.title === '가상 교체 · 마대 → 관우' &&
+      midFormationSwapPreviewProbe.panel.headline?.includes('OUT 마대') &&
+      midFormationSwapPreviewProbe.panel.headline?.includes('IN 관우') &&
+      midFormationSwapPreviewProbe.panel.impact?.includes('공백 돌파') &&
+      midFormationSwapPreviewProbe.panel.detail?.includes('+맥성 북문') &&
+      midFormationSwapPreviewProbe.panel.detail?.includes('-산길과 말발굽') &&
+      midFormationSwapPreviewProbe.panel.detail?.includes('실제 편성 미변경'),
+    `Expected the visible comparison panel to render the swap preview: ${JSON.stringify(midFormationSwapPreviewProbe.panel)}`
+  );
+  assert(
+    JSON.stringify(midFormationSwapPreviewState?.selectedSortieUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(midFormationSwapPreviewState?.campaign?.selectedSortieUnitIds) === JSON.stringify(midFormationCampaignSelectedBefore),
+    `Expected hover swap preview to preserve runtime and saved selections: ${JSON.stringify(midFormationSwapPreviewState?.selectedSortieUnitIds)}`
   );
   await page.screenshot({ path: `${screenshotDir}/rc-mid-camp-sortie-formation-hover.png`, fullPage: true });
   await page.mouse.move(40, 710);
-  await page.waitForFunction(() => window.__HEROS_DEBUG__?.camp()?.sortieHoveredUnitId === null, undefined, { timeout: 30000 });
+  await page.waitForFunction(() => {
+    const state = window.__HEROS_DEBUG__?.camp();
+    return state?.sortieHoveredUnitId === null && state?.sortieComparisonPreview?.source === 'focus';
+  }, undefined, { timeout: 30000 });
+  const afterSwapPreviewProbe = await page.evaluate(() => {
+    const scene = window.__HEROS_GAME__?.scene.getScene('CampScene');
+    const view = scene?.sortieComparisonPanelView;
+    return {
+      state: window.__HEROS_DEBUG__?.camp(),
+      panel: {
+        title: view?.title?.text ?? null,
+        headline: view?.headline?.text ?? null
+      }
+    };
+  });
+  const afterSwapPreviewState = afterSwapPreviewProbe.state;
+  assert(
+    JSON.stringify(afterSwapPreviewState?.selectedSortieUnitIds) === JSON.stringify(midFormationSelectedBefore) &&
+      JSON.stringify(afterSwapPreviewState?.campaign?.selectedSortieUnitIds) === JSON.stringify(midFormationCampaignSelectedBefore),
+    `Expected pointerout to restore focus preview without mutating selections: ${JSON.stringify(afterSwapPreviewState?.selectedSortieUnitIds)}`
+  );
+  assert(
+      afterSwapPreviewState?.sortieComparisonPreview?.source === 'focus' &&
+      afterSwapPreviewState?.sortieComparisonPreview?.mode === 'remove' &&
+      afterSwapPreviewState?.sortieComparisonPreview?.unitId === 'ma-dai' &&
+      afterSwapPreviewState?.sortieComparisonPreview?.incomingUnitId === null &&
+      afterSwapPreviewState?.sortieComparisonPreview?.outgoingUnitId === 'ma-dai' &&
+      afterSwapPreviewProbe.panel.title === '편성 변화 · 마대' &&
+      !afterSwapPreviewProbe.panel.headline?.includes('관우'),
+    `Expected pointerout to restore the visible Ma Dai focus preview: ${JSON.stringify(afterSwapPreviewProbe)}`
+  );
 
   const midFormationFirstPage = await page.evaluate(() => window.__HEROS_DEBUG__?.camp()?.sortiePortraitRosterView);
   await page.mouse.click(658, 196);
diff --git a/src/game/scenes/CampScene.ts b/src/game/scenes/CampScene.ts
index d23d393..a46f4db 100644
--- a/src/game/scenes/CampScene.ts
+++ b/src/game/scenes/CampScene.ts
@@ -337,6 +337,46 @@ type SortieUnitSynergyPreview = {
   comparison?: SortieSynergyComparison;
 };
 
+type SortieComparisonMetric = {
+  key: 'attack' | 'intelligence' | 'move' | 'terrain';
+  label: string;
+  current: number;
+  projected: number;
+  delta: number;
+};
+
+type SortieFormationComparisonPreview = {
+  source: 'focus' | 'hover-add' | 'hover-swap' | 'hover-blocked';
+  mode: SortieUnitSynergyPreview['mode'] | 'swap';
+  unitId: string;
+  incomingUnitId: string | null;
+  incomingUnitName: string | null;
+  outgoingUnitId: string | null;
+  outgoingUnitName: string | null;
+  selectedUnitIds: string[];
+  projectedSelectedUnitIds: string[];
+  headline: string;
+  detail: string;
+  metrics: SortieComparisonMetric[];
+  current: SortieSynergySnapshot;
+  projected?: SortieSynergySnapshot;
+  comparison?: SortieSynergyComparison;
+};
+
+type SortieComparisonPanelView = {
+  background: Phaser.GameObjects.Rectangle;
+  title: Phaser.GameObjects.Text;
+  summary: Phaser.GameObjects.Text;
+  headline: Phaser.GameObjects.Text;
+  metrics: {
+    background: Phaser.GameObjects.Rectangle;
+    label: Phaser.GameObjects.Text;
+    value: Phaser.GameObjects.Text;
+  }[];
+  impact: Phaser.GameObjects.Text;
+  detail: Phaser.GameObjects.Text;
+};
+
 type CampaignTimelineChapter = {
   id: string;
   title: string;
@@ -10784,6 +10824,7 @@ export class CampScene extends Phaser.Scene {
   private sortieItemAssignments: CampaignSortieItemAssignments = {};
   private sortieFocusedUnitId = 'liu-bei';
   private sortieHoveredUnitId?: string;
+  private sortieComparisonPanelView?: SortieComparisonPanelView;
   private sortieRosterScroll = 0;
   private sortiePlanFeedback = '';
   private sortiePrepStep: SortiePrepStep = 'briefing';
@@ -10804,6 +10845,7 @@ export class CampScene extends Phaser.Scene {
     this.contentObjects = [];
     this.dialogueObjects = [];
     this.sortieObjects = [];
+    this.sortieComparisonPanelView = undefined;
     this.saveSlotObjects = [];
     this.saveSlotConfirmObjects = [];
     this.pendingSaveSlot = undefined;
@@ -12762,6 +12804,7 @@ export class CampScene extends Phaser.Scene {
       );
       card.on('pointerover', () => {
         this.sortieHoveredUnitId = unit.id;
+        this.refreshCampaignSortieComparisonPanel();
         card.setFillStyle(!availability.available ? 0x15191e : selected ? 0x20362a : 0x1d2731, 0.98);
         card.setStrokeStyle(2, palette.gold, 0.98);
         accent.setFillStyle(palette.gold, 0.98);
@@ -12774,6 +12817,7 @@ export class CampScene extends Phaser.Scene {
         if (this.sortieHoveredUnitId === unit.id) {
           this.sortieHoveredUnitId = undefined;
         }
+        this.refreshCampaignSortieComparisonPanel();
         card.setFillStyle(fill, !availability.available ? 0.62 : 0.96);
         card.setStrokeStyle(restingStrokeWidth, availability.available ? accentColor : 0x53606c, restingStrokeAlpha);
         accent.setFillStyle(accentColor, focused || selected ? 0.94 : recommendation ? 0.72 : 0.34);
@@ -12822,46 +12866,170 @@ export class CampScene extends Phaser.Scene {
   }
 
   private renderCampaignSortieComparisonPanel(x: number, y: number, width: number, height: number, depth: number) {
-    const focused = this.sortieFocusedUnit();
-    const synergy = this.sortieSynergySnapshot();
-    const plan = this.sortiePlanSummary();
     const bg = this.trackSortie(this.add.rectangle(x, y, width, height, 0x151f2a, 0.96));
     bg.setOrigin(0);
     bg.setDepth(depth);
-    bg.setStrokeStyle(1, synergy.coveredRoleCount === 3 ? palette.green : palette.gold, 0.58);
-    this.trackSortie(this.add.text(x + 18, y + 12, focused ? `편성 변화 · ${focused.name}` : '편성 변화', this.textStyle(16, '#f2e3bf', true))).setDepth(depth + 1);
-    this.trackSortie(
-      this.add.text(
-        x + width - 18,
-        y + 14,
-        `공명 ${synergy.activeBondCount} · 역할 ${synergy.coveredRoleCount}/3 · 지형 ${synergy.terrainGrade}`,
-        this.textStyle(10, '#d8b15f', true)
-      )
-    ).setOrigin(1, 0).setDepth(depth + 1);
+    const title = this.trackSortie(this.add.text(x + 18, y + 9, '편성 변화', this.textStyle(15, '#f2e3bf', true)));
+    title.setDepth(depth + 1);
+    const summary = this.trackSortie(this.add.text(x + width - 18, y + 11, '', this.textStyle(9, '#d8b15f', true)));
+    summary.setOrigin(1, 0);
+    summary.setDepth(depth + 1);
+    const headline = this.trackSortie(this.add.text(x + 18, y + 31, '', this.textStyle(11, '#c8d2dd', true)));
+    headline.setDepth(depth + 1);
 
-    if (!focused) {
-      this.trackSortie(this.add.text(x + 18, y + 44, '왼쪽 초상 카드를 선택하면 합류·해제 전후가 표시됩니다.', this.textStyle(12, '#9fb0bf'))).setDepth(depth + 1);
+    const metricGap = 6;
+    const metricWidth = Math.floor((width - 36 - metricGap * 3) / 4);
+    const metricLabels: SortieComparisonMetric['label'][] = ['공격', '지력', '기동', '지형'];
+    const metrics = metricLabels.map((label, index) => {
+      const metricX = x + 18 + index * (metricWidth + metricGap);
+      const background = this.trackSortie(this.add.rectangle(metricX, y + 51, metricWidth, 32, 0x111922, 0.9));
+      background.setOrigin(0);
+      background.setDepth(depth + 1);
+      background.setStrokeStyle(1, 0x53606c, 0.34);
+      const labelText = this.trackSortie(this.add.text(metricX + 7, y + 55, label, this.textStyle(8, '#9fb0bf', true)));
+      labelText.setDepth(depth + 2);
+      const value = this.trackSortie(this.add.text(metricX + metricWidth - 7, y + 65, '-', this.textStyle(10, '#c8d2dd', true)));
+      value.setOrigin(1, 0);
+      value.setDepth(depth + 2);
+      return { background, label: labelText, value };
+    });
+    const impact = this.trackSortie(this.add.text(x + 18, y + 89, '', this.textStyle(10, '#d4dce6', true)));
+    impact.setDepth(depth + 1);
+    const detail = this.trackSortie(this.add.text(x + 18, y + 106, '', this.textStyle(9, '#9fb0bf')));
+    detail.setDepth(depth + 1);
+
+    this.sortieComparisonPanelView = {
+      background: bg,
+      title,
+      summary,
+      headline,
+      metrics,
+      impact,
+      detail
+    };
+    this.refreshCampaignSortieComparisonPanel();
+  }
+
+  private refreshCampaignSortieComparisonPanel() {
+    const view = this.sortieComparisonPanelView;
+    if (!view) {
       return;
     }
-    const preview = this.sortieUnitSynergyPreview(focused);
-    const previewColor = preview.mode === 'remove'
-      ? '#ff9d7d'
-      : preview.mode === 'add' || preview.mode === 'current'
-        ? '#a8ffd0'
+
+    const preview = this.sortieFormationComparisonPreview();
+    const current = preview?.current ?? this.sortieSynergySnapshot();
+    const projected = preview?.projected ?? current;
+    const showMetricTransition = Boolean(preview?.projected);
+    const comparison = preview?.comparison;
+    const isHoverPreview = preview?.source === 'hover-add' || preview?.source === 'hover-swap';
+    const lostRole = Boolean(comparison?.lostRoles.length);
+    const completeFormation = projected.coveredRoleCount === coreSortieSynergyRoles.length;
+    view.background.setStrokeStyle(
+      lostRole ? 2 : 1,
+      lostRole ? palette.red : isHoverPreview ? palette.gold : completeFormation ? palette.green : palette.gold,
+      lostRole ? 0.78 : isHoverPreview ? 0.72 : 0.58
+    );
+
+    if (!preview) {
+      view.title.setText('편성 변화');
+      view.summary.setText(`공명 ${current.activeBondCount} · 역할 ${current.coveredRoleCount}/3 · 지형 ${current.terrainGrade}`);
+      view.headline.setText('출전 무장을 클릭해 교체 기준으로 고정하십시오.').setColor('#9fb0bf');
+      view.metrics.forEach((metric) => {
+        metric.background.setFillStyle(0x111922, 0.9).setStrokeStyle(1, 0x53606c, 0.34);
+        metric.value.setText('-').setColor('#77818c');
+      });
+      view.impact.setText('후보 초상에 마우스를 올리면 역할·공명 변화가 표시됩니다.').setColor('#d4dce6');
+      view.detail.setText('미리보기는 실제 출전 명단과 보급을 변경하지 않습니다.').setColor('#9fb0bf');
+      return;
+    }
+
+    const title = preview.source === 'hover-swap'
+      ? `가상 교체 · ${preview.outgoingUnitName} → ${preview.incomingUnitName}`
+      : preview.source === 'hover-add'
+        ? `가상 합류 · ${preview.incomingUnitName}`
+        : `편성 변화 · ${this.unitName(preview.unitId)}`;
+    view.title.setText(this.compactText(title, 28));
+    view.summary.setText(
+      this.compactText(
+        `공명 ${current.activeBondCount}→${projected.activeBondCount} · 역할 ${current.coveredRoleCount}/3→${projected.coveredRoleCount}/3 · 지형 ${projected.terrainGrade}`,
+        38
+      )
+    );
+    const headlineColor = preview.source === 'hover-swap' || preview.mode === 'add'
+      ? '#a8ffd0'
+      : preview.mode === 'remove'
+        ? '#ff9d7d'
         : preview.mode === 'waiting'
           ? '#ffdf7b'
-          : '#87919c';
-    this.trackSortie(this.add.text(x + 18, y + 39, this.compactText(preview.headline, 54), this.textStyle(12, previewColor, true))).setDepth(depth + 1);
-    this.trackSortie(this.add.text(x + 18, y + 62, this.compactText(preview.detail, 66), this.textStyle(10, '#c8d2dd'))).setDepth(depth + 1);
-    const feedback = this.sortiePlanFeedback || plan.warningLine;
-    this.trackSortie(
-      this.add.text(
-        x + 18,
-        y + height - 27,
-        this.compactText(feedback, 64),
-        this.textStyle(10, this.sortiePlanFeedback ? '#a8ffd0' : plan.warnings.length > 0 ? '#ffdf7b' : '#9fb0bf', true)
+          : preview.mode === 'blocked'
+            ? '#87919c'
+            : '#d4dce6';
+    view.headline.setText(this.compactText(preview.headline, 64)).setColor(headlineColor);
+
+    view.metrics.forEach((metricView, index) => {
+      const metric = preview.metrics[index];
+      if (!metric) {
+        metricView.background.setFillStyle(0x111922, 0.9).setStrokeStyle(1, 0x53606c, 0.34);
+        metricView.value.setText('-').setColor('#77818c');
+        return;
+      }
+      const positive = metric.delta > 0;
+      const negative = metric.delta < 0;
+      const tone = positive ? palette.green : negative ? palette.red : 0x53606c;
+      const fill = positive ? 0x172a22 : negative ? 0x2a1b18 : 0x111922;
+      const color = positive ? '#a8ffd0' : negative ? '#ff9d7d' : '#c8d2dd';
+      const delta = metric.delta > 0 ? `+${metric.delta}` : `${metric.delta}`;
+      metricView.label.setText(metric.label);
+      metricView.background.setFillStyle(fill, 0.92).setStrokeStyle(1, tone, positive || negative ? 0.58 : 0.34);
+      metricView.value
+        .setText(showMetricTransition ? `${metric.current}→${metric.projected} ${delta}` : `${metric.current}`)
+        .setColor(color);
+    });
+
+    if (!comparison) {
+      view.impact
+        .setText(this.compactText(preview.detail, 68))
+        .setColor(preview.mode === 'blocked' ? '#87919c' : preview.mode === 'waiting' ? '#ffdf7b' : '#d4dce6');
+      view.detail
+        .setText('미리보기 · 실제 출전 명단·역할·보급은 변경되지 않습니다.')
+        .setColor('#9fb0bf');
+      return;
+    }
+
+    const gainedRoleLabels = comparison?.gainedRoles.map((role) => this.sortieFormationRoleLabel(role)) ?? [];
+    const lostRoleLabels = comparison?.lostRoles.map((role) => this.sortieFormationRoleLabel(role)) ?? [];
+    const roleChanges = [
+      lostRoleLabels.length > 0 ? `공백 ${lostRoleLabels.join('·')}` : '',
+      gainedRoleLabels.length > 0 ? `보강 ${gainedRoleLabels.join('·')}` : ''
+    ].filter(Boolean);
+    const roleChange = roleChanges.join(' · ') || '역할 유지';
+    const bondDelta = comparison?.activeBondDelta ?? 0;
+    const signedBondDelta = bondDelta > 0 ? `+${bondDelta}` : `${bondDelta}`;
+    view.impact
+      .setText(
+        this.compactText(
+          `역할 ${current.coveredRoleCount}/3→${projected.coveredRoleCount}/3 · 공명 ${current.activeBondCount}→${projected.activeBondCount} (${signedBondDelta}) · ${roleChange}`,
+          68
+        )
       )
-    ).setDepth(depth + 1);
+      .setColor(lostRoleLabels.length > 0 ? '#ff9d7d' : gainedRoleLabels.length > 0 || bondDelta > 0 ? '#a8ffd0' : '#d4dce6');
+
+    const gainedBonds = comparison?.gainedBonds.map((bond) => `+${bond.title}`) ?? [];
+    const lostBonds = comparison?.lostBonds.map((bond) => `-${bond.title}`) ?? [];
+    const bondLine = [gainedBonds[0], lostBonds[0], ...gainedBonds.slice(1), ...lostBonds.slice(1)]
+      .filter((bond): bond is string => Boolean(bond))
+      .slice(0, 2)
+      .join(' · ') || '공명 변화 없음';
+    const terrainDelta = projected.terrainScore - current.terrainScore;
+    const signedTerrainDelta = terrainDelta > 0 ? `+${terrainDelta}` : `${terrainDelta}`;
+    view.detail
+      .setText(
+        this.compactText(
+          `${bondLine} · 지형 ${current.terrainGrade} ${current.terrainScore}→${projected.terrainGrade} ${projected.terrainScore} (${signedTerrainDelta}) · 실제 편성 미변경`,
+          82
+        )
+      )
+      .setColor(isHoverPreview ? '#ffdf7b' : '#9fb0bf');
   }
 
   private renderFirstSortieRoleDiagram(x: number, y: number, width: number, height: number, depth: number) {
@@ -13965,6 +14133,160 @@ export class CampScene extends Phaser.Scene {
     });
   }
 
+  private sortieFormationComparisonPreview(): SortieFormationComparisonPreview | undefined {
+    const scenario = this.nextSortieScenario();
+    const selectedUnitIds = [...this.selectedSortieUnitIds];
+    const selectedIds = new Set(selectedUnitIds);
+    const current = this.sortieSynergySnapshot(selectedUnitIds, scenario);
+    const focused = this.sortieFocusedUnit();
+    const hovered = this.sortieHoveredUnitId
+      ? this.sortieRosterUnits().find((unit) => unit.id === this.sortieHoveredUnitId)
+      : undefined;
+
+    if (hovered && hovered.id !== focused?.id && !selectedIds.has(hovered.id)) {
+      const availability = this.sortieUnitAvailability(hovered, scenario);
+      if (!availability.available) {
+        return {
+          source: 'hover-blocked',
+          mode: 'blocked',
+          unitId: hovered.id,
+          incomingUnitId: hovered.id,
+          incomingUnitName: hovered.name,
+          outgoingUnitId: null,
+          outgoingUnitName: null,
+          selectedUnitIds,
+          projectedSelectedUnitIds: selectedUnitIds,
+          headline: `${hovered.name} 편성 불가 · ${availability.reason}`,
+          detail: '현재 출전 명단은 유지됩니다.',
+          metrics: this.sortieComparisonMetrics(hovered, hovered, scenario),
+          current
+        };
+      }
+
+      if (selectedUnitIds.length < this.sortieMaxUnits(scenario)) {
+        const projectedSelectedUnitIds = [...selectedUnitIds, hovered.id];
+        const projected = this.sortieSynergySnapshot(projectedSelectedUnitIds, scenario);
+        const comparison = compareSortieSynergy(current, projected);
+        return {
+          source: 'hover-add',
+          mode: 'add',
+          unitId: hovered.id,
+          incomingUnitId: hovered.id,
+          incomingUnitName: hovered.name,
+          outgoingUnitId: null,
+          outgoingUnitName: null,
+          selectedUnitIds,
+          projectedSelectedUnitIds,
+          headline: `IN ${hovered.name} · ${this.sortieFormationRoleLabel(this.sortieFormationRole(hovered, scenario))} 합류`,
+          detail: `빈 출전 슬롯에 합류했을 때의 가상 결과입니다.`,
+          metrics: this.sortieComparisonMetrics(undefined, hovered, scenario),
+          current,
+          projected,
+          comparison
+        };
+      }
+
+      const outgoing = focused && selectedIds.has(focused.id) && !this.isRequiredSortieUnit(focused.id)
+        ? focused
+        : undefined;
+      if (!outgoing) {
+        return {
+          source: 'hover-blocked',
+          mode: 'waiting',
+          unitId: hovered.id,
+          incomingUnitId: hovered.id,
+          incomingUnitName: hovered.name,
+          outgoingUnitId: null,
+          outgoingUnitName: null,
+          selectedUnitIds,
+          projectedSelectedUnitIds: selectedUnitIds,
+          headline: `교체 기준 필요 · 출전 중인 비필수 무장을 먼저 클릭하세요.`,
+          detail: `${hovered.name} 후보는 아직 실제 편성에 반영되지 않았습니다.`,
+          metrics: this.sortieComparisonMetrics(hovered, hovered, scenario),
+          current
+        };
+      }
+
+      const projectedSelectedUnitIds = selectedUnitIds.map((unitId) => unitId === outgoing.id ? hovered.id : unitId);
+      const projected = this.sortieSynergySnapshot(projectedSelectedUnitIds, scenario);
+      const comparison = compareSortieSynergy(current, projected);
+      const outgoingRole = this.sortieFormationRoleLabel(this.sortieFormationRole(outgoing, scenario));
+      const incomingRole = this.sortieFormationRoleLabel(this.sortieFormationRole(hovered, scenario));
+      return {
+        source: 'hover-swap',
+        mode: 'swap',
+        unitId: hovered.id,
+        incomingUnitId: hovered.id,
+        incomingUnitName: hovered.name,
+        outgoingUnitId: outgoing.id,
+        outgoingUnitName: outgoing.name,
+        selectedUnitIds,
+        projectedSelectedUnitIds,
+        headline: `OUT ${outgoing.name} ${outgoingRole} · IN ${hovered.name} ${incomingRole}`,
+        detail: `${outgoing.name} 대신 ${hovered.name}을 투입했을 때의 가상 결과입니다.`,
+        metrics: this.sortieComparisonMetrics(outgoing, hovered, scenario),
+        current,
+        projected,
+        comparison
+      };
+    }
+
+    if (!focused) {
+      return undefined;
+    }
+
+    const focusedPreview = this.sortieUnitSynergyPreview(focused);
+    const focusedSelected = selectedIds.has(focused.id);
+    const projected = focusedPreview.projected;
+    return {
+      source: 'focus',
+      mode: focusedPreview.mode,
+      unitId: focused.id,
+      incomingUnitId: focusedSelected ? null : focused.id,
+      incomingUnitName: focusedSelected ? null : focused.name,
+      outgoingUnitId: focusedSelected && !this.isRequiredSortieUnit(focused.id) ? focused.id : null,
+      outgoingUnitName: focusedSelected && !this.isRequiredSortieUnit(focused.id) ? focused.name : null,
+      selectedUnitIds,
+      projectedSelectedUnitIds: projected?.selectedUnitIds ?? selectedUnitIds,
+      headline: focusedPreview.headline,
+      detail: focusedPreview.detail,
+      metrics: focusedPreview.mode === 'add'
+        ? this.sortieComparisonMetrics(undefined, focused, scenario)
+        : focusedPreview.mode === 'remove'
+          ? this.sortieComparisonMetrics(focused, undefined, scenario)
+          : this.sortieComparisonMetrics(focused, focused, scenario),
+      current,
+      projected,
+      comparison: focusedPreview.comparison
+    };
+  }
+
+  private sortieComparisonMetrics(
+    currentUnit: UnitData | undefined,
+    projectedUnit: UnitData | undefined,
+    scenario = this.nextSortieScenario()
+  ): SortieComparisonMetric[] {
+    const currentAttack = currentUnit ? currentUnit.attack + this.equipmentAttackBonus(currentUnit) : 0;
+    const projectedAttack = projectedUnit ? projectedUnit.attack + this.equipmentAttackBonus(projectedUnit) : 0;
+    const values: Omit<SortieComparisonMetric, 'delta'>[] = [
+      { key: 'attack', label: '공격', current: currentAttack, projected: projectedAttack },
+      {
+        key: 'intelligence',
+        label: '지력',
+        current: currentUnit?.stats.intelligence ?? 0,
+        projected: projectedUnit?.stats.intelligence ?? 0
+      },
+      { key: 'move', label: '기동', current: currentUnit?.move ?? 0, projected: projectedUnit?.move ?? 0 },
+      {
+        key: 'terrain',
+        label: '지형',
+        current: currentUnit ? this.sortieTerrainScore(currentUnit, scenario) : 0,
+        projected: projectedUnit ? this.sortieTerrainScore(projectedUnit, scenario) : 0
+      }
+    ];
+    return values.map((metric) => ({ ...metric, delta: metric.projected - metric.current }));
+  }
+
   private sortieUnitSynergyPreview(unit: UnitData): SortieUnitSynergyPreview {
     const scenario = this.nextSortieScenario();
     const current = this.sortieSynergySnapshot(this.selectedSortieUnitIds, scenario);
@@ -15075,6 +15397,7 @@ export class CampScene extends Phaser.Scene {
     this.sortieObjects.forEach((object) => object.destroy());
     this.sortieObjects = [];
     this.sortieHoveredUnitId = undefined;
+    this.sortieComparisonPanelView = undefined;
   }
 
   private trackSortie<T extends Phaser.GameObjects.GameObject>(object: T) {
@@ -16894,6 +17217,7 @@ export class CampScene extends Phaser.Scene {
       sortieDeploymentPreview: this.sortieDeploymentPreviewDebug(),
       sortieFocusedUnitId: this.sortieFocusedUnitId,
       sortieHoveredUnitId: this.sortieHoveredUnitId ?? null,
+      sortieComparisonPreview: this.sortieFormationComparisonPreview() ?? null,
       sortieFocusedUnit: this.sortieFocusedUnitSummary(),
       sortiePlanFeedback: this.sortiePlanFeedback,
       sortieChecklist,