Korean fans do not use proxy ticketing either

Fan-to-fan ticket trading is common in Korea, but paying a stranger first is not. Korean press has repeatedly reported proxy-ticketing scams aimed at overseas fans.
The shape of it is always the same. Someone offers to buy the ticket for you, takes a deposit, then keeps asking for more under names like transfer fee, account protection deposit, or a charge to release an escrow.
None of those things exist at the ticket sellers. There is no process by which a seller collects such money from a private person. The moment a second payment is requested is the moment it is confirmed as a scam.
The way it grows is fixed too: sending more money to recover what was already sent. Treat the first payment as lost and stop there.
Korean fans look up the account number and name on a fraud-report site first, and use a trading platform such as Ticketbay rather than a private transfer.
The safest route is buying under your own name. Korean sellers usually verify by Korean mobile number, but Interpark runs a separate site for overseas buyers: ticket.globalinterpark.com verifies you by passport, and once done it holds for a year.