If you have booked tickets with Asiana Airlines and wish to cancel them due to any personal or emergency reasons then you can do so by following Asiana Airlines cancellation policy. Customers are expected to reap great benefits by making good use of Asiana Airlines 24-hour closing rules that allow seasons to be completed within 24 hours of the first purchase on the same day. Non -payment of termination fees. In doing so, customers will be allowed a full refund within 7 days or more of the booked ticket prior to departure. Return tickets and non -refundable tickets will be accepted for full payment if canceled within 24 hours of departure.

https://www.cancellation-policy.com/asiana-airlines-cancellation-policy