I don't think so. When I went to Korea, I only used internationally accepted credit cards with visa logo. Ordinary CCB Dragon Card should not be used. And I only use a credit card when I promise to rent a mobile phone, and I don't really use a credit card to pay because the handling fee is not cheap. The people who traveled with me also swiped their credit cards when there was really no cash (insufficient cash exchange before coming). Personally, I don't think it's necessary. Exchange rate conversion is very troublesome, not to mention the handling fee. It's hard for you to figure out the account yourself. There is a money exchange place in Mingdong, which is very convenient and the price is reasonable. I changed a part at Beijing Airport and a part at Myeongdong. There is not much difference. In theory, cards with the visa logo are used all over the world, but there must be a handling fee. It is recommended to swipe your card when you have no cash, and use cash when you have cash.