Please visit the AREX official website (https://www.airportrailroad.com/co/main.do) and access your reserved record to apply for a time change. The ticket change policy is usually as follows: the first change is free; from the second change onward, a fee of 1,000 KRW is charged for each change, with a maximum of three changes allowed. If the original departure time has already passed, changes are generally not allowed. In this case, you will need to follow on-site regulations to either get a refund or purchase a new ticket.

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Excuse me, I have already successfully reserved a seat on the Arex line online. How can I change the time online?