Ethan Choi 
If a KTX ticket does not appear in Korail+ after booking, use the original booking channel to check whether a ticket was issued before paying again. This guide covers Korail+ My Ticket, non-member access, KORAIL website bookings and legacy Home Tickets.
Seoul’s 15-minute subway re-entry rule can save you from paying another basic fare if you exit and return through the same station and line. Here’s where it works, which cards qualify, and which railways are excluded.
If a Korean ATM retains your foreign-issued card, stay by the machine, record its details, contact the operator, secure the card through your issuer, and switch to replacement if recovery is uncertain.