Avoid at any cost
Booked tickets for 1st class in Korea. Got the tickets before the start of my journey. While in the train, guy approached me saying I was in his seat. Got kicket out of the train because conductor said my ticket was refunded. I never asked for a cancellation or a refund. Support agent told me that Korean operator cancelled my tickets. Nobody informed me about the cancellation or about the refund. If I didn't contact them, they wouldn't even give me my money back. Had to buy new ticket to get to my destination