If you cannot board after paying for your ticket, you can change your reservation or refund after paying for the service fee according to the fare types. Depending on the typse of fare, there may be a restriction on the change of reservation or refund.
Please note that there may be additional charge for the tickets usable later depending on the fare conditions and at the reservation change timing.
Also please note that No-show penalty will be applied as below
ㅇ Domestic Flights : If you do not cancel your booking before departure time or if you do not board after check in.
ㅇ International Flights : If you do not cancel your booking before check-in closing time(50minutes before departure) or if you do not board after check in.