In Korea, Google Maps does not work very well. Instead, you can use Naver Map. You can also download the application:
(Android) https://play.google.com/store/apps/details?id=com.nhn.android.nmap&hl=en
(Apple) https://apps.apple.com/us/app/naver-maps-navigation/id311867728
Public transportation:
- To use public transit, you need a transportation card, which you can buy at a nearby convenience store.
- You can also charge the card at convenience stores, but the charge must be done with cash.
Credit cards are the most commonly used payment method, and most stores prefer them over cash. However, traditional markets and a few small shops may still prefer cash.