I do not trust this people or airlines.
Even you have confirmed ticket .it does not mean nothing
at the airport .they tell you .sorry we have issue with you ticket you need to pay extra $ 2000 or $ 3000(full ticket price at that time at the airport)
if you live in Korea is ok .nothing to lose. Just you go back home .

Even you have confirmed ticket
at the airport, they tell you we have different systems that you do not see. Sorry, we do not have a confirmed ticket . If you llike, you can buy a ticket full price at the last counter