However, the exchange rate is not suitable for general UnionPay credit cards. If you know, you can take some RMB with you to exchange money (Korean won is not known to be fake at present, so you can rest assured), but it is best not to exceed 3 thousand cash at most, and don't exchange too much at a time (entry and exit regulations stipulate that cash should not exceed 5, US dollars at most, and it is generally unnecessary to say more).
In addition, especially if you exchange money with a group tour, you must pay attention to the exchange rate, at least not lower than the average exchange rate of the day.
even if you bring cash, you'd better bring UnionPay cards with you (except those who can't control their consumption).