The standard bus fare will be 1,200 won with a 50 won discount for using a transportation card. You can travel anywhere on the island using certain buses for 1,200 won.https://blog.trazy.com/getting-around-jeju-island-in-south-korea-public-transportation-transport-info/
价格的话市内公交成人是1000/1200韩元 (约人民币6/7元),买张t-money卡换乘还能有优惠