The arrival chapter, every replay, and any line you have heard before. A new install starts with 12 new lines; after that a new line uses one credit — or nothing with Seoul Pass.
Seoul Pass follows your Apple Account: open the menu ▸ Seoul Pass ▸ Restore Purchases. Line credits stay on the device that bought them.
Yes, through your iCloud. Start over (menu ▸ Settings) begins again on every device.
Menu ▸ Settings ▸ Send feedback — we answer inside the app. Or write to hello@swiftian.com.