You'd better find a good translator here, especially college students.

Suggestion:

1, you can change your cash into dollars, which is easy to carry and you can change it there.

Don't rush to exchange when you arrive, especially don't exchange with the tour guide. Many people in China do this, which is very cheat people. Go to the bank or supermarket to change it. Some hospitals can also change. There are standards for formal place change, and it doesn't matter if it's cost-effective or not.

3, be sure to go to a regular hospital, don't trust the intermediary introduction easily. As for how to bargain with the hospital, it is not clear. I suggest you take an interpreter to see more hospital rules and regulations, and you can also ask Korean social volunteers for help. Most of them are decent and kind.

Good luck.