KORAIL's official mobile FAQ explains that waitlisting may be available for sold-out seats two days before train departure. Select a train marked 'Waitlist' in the search results to apply; cancelled seats are assigned according to the waitlist order.
A waitlist request is not a confirmed ticket. If a seat is allocated, payment must be completed by midnight (24:00) that same day. If payment is not made, the reservation is automatically cancelled. Check your application status, allocation, and payment deadline directly through KORAIL's official booking channel before travel.
Allocation timing and availability are not guaranteed. Only the official booking system can show live seat and payment information.