How to use public transportation in Korea 1. Bus T-money card is essential: It can be purchased at convenience stores and used for subways, buses, taxis, and even in convenience stores. 2. Tax Use the KakaoT app: It is useful for calling taxis, and in Korea, using the app is more convenient than hailing a taxi on the street. You can pay via credit card You can learn how to use kakao T app by referring below link https://naver.me/G65gkOCm South Korea