What currency should I take with me?
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In Korea, you can exchange major world currencies (US dollars, yuan, yen, euro) at exchange offices and banks.
In addition, the vast majority of sellers (including market traders) accept Visa and Master Card credit cards.
Union Pay does not work everywhere!
Of course, Korean won is accepted everywhere too!
Of course, Korean won is accepted almost everywhere too!
"Almost": recently cafes and other establishments have appeared, for example, the Busan Aquarium, where payment can only be made by credit card.