For reserved seats on the AREX Express Train, even after you’ve checked your luggage with the airline at Seoul Station, you can generally “change your departure time.” However, you need to go to the ticket counter in person to make the change, and it depends on seat availability for your desired train. The usual ticket change policy is: the first change is free; from the second change onward, there is a 1,000 KRW fee per change, with a maximum of three changes allowed. If you reserved your ticket online, you can also request a time change online, following the same rules. If your original departure time has already passed, you typically cannot make changes and will need to follow the on-site rules for refunds or purchase a new ticket.

請問，如果arex已經畫位了，在首爾站也已經完成拖運行李了，還可以更改arex的出發時間嗎