How much won should I take with me when traveling with a group in Korea?

Don't exchange money at domestic and Korean airports.

wasteful

And don't switch with the tour guide.

If the tour route has Seoul myeongdong.

I suggest you go to myeongdong for a change.

The streets are full of "small houses" for changing money, so don't worry about fake money.

Every time I go to Korea, I bring RMB cash.

Change it over there.

Very convenient

If the converted won is not spent when returning to China,

At the Korean airport, you can also exchange your favorite RMB ~~~PS: If you are shopping in a shopping mall.

Most department stores have UnionPay card discounts ~ ~