diff --git a/apps/web/tests/details-session-lifecycle.e2e.ts b/apps/web/tests/details-session-lifecycle.e2e.ts
index cb6c9ba914..c88a823fb7 100644
--- a/apps/web/tests/details-session-lifecycle.e2e.ts
+++ b/apps/web/tests/details-session-lifecycle.e2e.ts
@@ -121,7 +121,7 @@ describe.skipIf(MODE === 'record')('web e2e: details panel follows the current S
     expect(await page.getByText('Details', { exact: true }).isVisible()).toBe(false)
 
     await page.getByRole('button', { name: /^(?:New session|新.*会话)$/ }).last().click()
-    await page.getByText("Let's start building", { exact: false }).waitFor({ timeout: 15_000 })
+    await page.getByText('Into the Unknown', { exact: false }).waitFor({ timeout: 15_000 })
     await expect.poll(() => detailsTrack(page), { timeout: 5_000 }).toBe(0)
     expect(await page.getByText('Details', { exact: true }).isVisible()).toBe(false)
 
diff --git a/apps/web/tests/hmr-live.e2e.ts b/apps/web/tests/hmr-live.e2e.ts
index df81a10402..cafd0fb474 100644
--- a/apps/web/tests/hmr-live.e2e.ts
+++ b/apps/web/tests/hmr-live.e2e.ts
@@ -75,8 +75,8 @@ it('hot-reloads a real client-plugin source edit without refreshing the page', a
   if (!existsSync(binPath)) throw new Error('HMR browser test needs the built dsh bin; run pnpm run build first')
   const originalSource = await readFile(sourcePath)
   const originalBundle = await readFile(bundlePath)
-  const oldText = "Let's start building"
-  const sourceNeedle = "'hero.headline': 'Let\\'s start building'"
+  const oldText = 'Into the Unknown'
+  const sourceNeedle = "'hero.headline': 'Into the Unknown'"
   const newText = `HMR UPDATED ${'x'.repeat(80)}`
   const updatedSource = originalSource.toString().replace(sourceNeedle, `'hero.headline': '${newText}'`)
   if (updatedSource === originalSource.toString()) throw new Error(`HMR source lacks ${JSON.stringify(sourceNeedle)}`)
diff --git a/apps/web/tests/lifecycle-chrome.e2e.ts b/apps/web/tests/lifecycle-chrome.e2e.ts
index 06c0cc591d..1aa6b3dea9 100644
--- a/apps/web/tests/lifecycle-chrome.e2e.ts
+++ b/apps/web/tests/lifecycle-chrome.e2e.ts
@@ -159,7 +159,7 @@ describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', ()
     }
     // The blank frame renders the hero, not the resident composer: the
     // headline plus the guidance placeholder are the empty state's anchors.
-    await expect.poll(() => page.getByText("Let's start building", { exact: false }).count(), { timeout: 15_000 }).toBe(1)
+    await expect.poll(() => page.getByText('Into the Unknown', { exact: false }).count(), { timeout: 15_000 }).toBe(1)
     const input = page.locator('textarea').first()
     await input.waitFor({ timeout: 10_000 })
     if (MODE !== 'record') {
diff --git a/apps/web/tests/snapshots/lifecycle-chrome/hero.expected.md b/apps/web/tests/snapshots/lifecycle-chrome/hero.expected.md
index 728dc768f8..dfa23ca508 100644
--- a/apps/web/tests/snapshots/lifecycle-chrome/hero.expected.md
+++ b/apps/web/tests/snapshots/lifecycle-chrome/hero.expected.md
@@ -20,7 +20,7 @@
 - button "Settings":
   - img
   - text: Settings
-- text: Let's start building Preview
+- text: Into the Unknown Preview
 - button "Choose workspace":
   - img
   - text: workspace
diff --git a/apps/web/tests/snapshots/lifecycle-chrome/plan-active.expected.md b/apps/web/tests/snapshots/lifecycle-chrome/plan-active.expected.md
index 968083919a..4ccab18ac7 100644
--- a/apps/web/tests/snapshots/lifecycle-chrome/plan-active.expected.md
+++ b/apps/web/tests/snapshots/lifecycle-chrome/plan-active.expected.md
@@ -20,7 +20,7 @@
 - button "Settings":
   - img
   - text: Settings
-- text: Let's start building Preview
+- text: Into the Unknown Preview
 - button "Choose workspace":
   - img
   - text: workspace
diff --git a/apps/web/tests/startup-auto-selection.e2e.ts b/apps/web/tests/startup-auto-selection.e2e.ts
index fea5217b73..21ad64e4ed 100644
--- a/apps/web/tests/startup-auto-selection.e2e.ts
+++ b/apps/web/tests/startup-auto-selection.e2e.ts
@@ -145,7 +145,7 @@ describe('web e2e: startup auto-selection', () => {
     // seat with `visibility:hidden`, which Playwright reports as not visible).
     await page.waitForSelector(ROOT_PHASE, { timeout: 15_000 })
     expect(await page.locator(ROOT_PHASE).first().getAttribute('data-phase')).toBe('hero')
-    expect(await page.getByText("Let's start building").isVisible()).toBe(true)
+    expect(await page.getByText('Into the Unknown').isVisible()).toBe(true)
     expect(await page.locator('textarea').first().isVisible()).toBe(true)
 
     releaseHistory()
diff --git a/packages/client/ui-conversation/src/client/locales.ts b/packages/client/ui-conversation/src/client/locales.ts
index 9ba5ed3876..df107d2cd2 100644
--- a/packages/client/ui-conversation/src/client/locales.ts
+++ b/packages/client/ui-conversation/src/client/locales.ts
@@ -44,7 +44,7 @@ export const zh = {
   'access.confirm.acknowledge': '我已了解风险，并愿意继续',
   'access.confirm.cancel': '取消',
   'access.confirm.enable': '启用 Full access',
-  'hero.headline': '开始构建吧',
+  'hero.headline': '探索未知之境',
   'hero.preview': '预览版',
   'hero.chooseWorkspace': '选择工作区',
   'session.hierarchy': '会话层级',
@@ -184,7 +184,7 @@ export const en = {
   'access.confirm.acknowledge': 'I understand the risks and want to continue',
   'access.confirm.cancel': 'Cancel',
   'access.confirm.enable': 'Enable Full access',
-  'hero.headline': 'Let\'s start building',
+  'hero.headline': 'Into the Unknown',
   'hero.preview': 'Preview',
   'hero.chooseWorkspace': 'Choose workspace',
   'session.hierarchy': 'Session hierarchy',
diff --git a/packages/client/ui-conversation/tests/skeleton.spec.tsx b/packages/client/ui-conversation/tests/skeleton.spec.tsx
index bcd8f25e73..ea35284ad8 100644
--- a/packages/client/ui-conversation/tests/skeleton.spec.tsx
+++ b/packages/client/ui-conversation/tests/skeleton.spec.tsx
@@ -255,7 +255,7 @@ function mount(
 describe('Hero chrome', () => {
   it('renders the English preview badge through the hero locale seat', () => {
     const view = render(<HeroShell t={makeTranslate(en, commonEn)} />)
-    expect(view.getByText('Let\'s start building')).toBeTruthy()
+    expect(view.getByText('Into the Unknown')).toBeTruthy()
     expect(view.getByText('Preview')).toBeTruthy()
   })
 })
@@ -351,7 +351,7 @@ describe('ConversationRoot resident composer', () => {
     const header = b.view.container.querySelector('header')
     expect(host).not.toBeNull()
     expect(header?.getAttribute('aria-hidden')).toBe('true')
-    expect(b.view.getByText('开始构建吧')).toBeTruthy()
+    expect(b.view.getByText('探索未知之境')).toBeTruthy()
     expect(b.view.getByText('预览版')).toBeTruthy()
     expect(b.view.queryByTestId('view-chat')).toBeNull()
     // The same machine-backed textarea is live in the hero, and the
@@ -375,7 +375,7 @@ describe('ConversationRoot resident composer', () => {
     const b = mount(conversationSnapshot({ composerPhase: 'blank', blank: true, openState: 'loading' }))
     const root = b.view.container.querySelector('[data-phase]')
     expect(root?.getAttribute('data-phase')).toBe('settling')
-    expect(b.view.queryByText('开始构建吧')).toBeNull()
+    expect(b.view.queryByText('探索未知之境')).toBeNull()
   })
 
   it('settling phase: a session the list has no row for settles conservatively', () => {
@@ -400,7 +400,7 @@ describe('ConversationRoot resident composer', () => {
     // blank the column for the history round-trip.
     const root = b.view.container.querySelector('[data-phase]')
     expect(root?.getAttribute('data-phase')).toBe('hero')
-    expect(b.view.getByText('开始构建吧')).toBeTruthy()
+    expect(b.view.getByText('探索未知之境')).toBeTruthy()
     expect(b.view.getByRole('textbox')).toBeTruthy()
   })
 
@@ -418,7 +418,7 @@ describe('ConversationRoot resident composer', () => {
     expect(after.value).toBe('kept across flip')
     expect(b.chat.store.getSnapshot().draft).toBe('kept across flip')
     expect(b.view.container.querySelector('[data-conversation-scroll]')?.contains(after)).toBe(true)
-    expect(b.view.queryByText('开始构建吧')).toBeNull()
+    expect(b.view.queryByText('探索未知之境')).toBeNull()
     expect(b.view.getByTestId('view-chat')).toBeTruthy()
   })