MasterCard can be used in Korea. MasterCard is universal. MasterCard can be used in places where you can swipe your card in Korea.

The mainstream credit cards in Korea include visa, mastercard, bc, amex, dinersclub, jcb and so on. Some banks also issue UnionPay cards.

MasterCard is a brand owned by mastercard international, and mastercard international is the second largest credit card group in the world.