Is it necessary to buy a T-MONEY card to prepare for a free trip to Jeju Island?

It is still necessary. Transportation cards are cheaper than cash, and there are two transfer discounts every day, so many people can use them once.

The bus concessions in Jeju are as follows (the bus in the city refers to the short-distance bus in the city and the bus outside the city refers to the long-distance bus, basically excluding short-distance, and the fare is about 1350 in 8 yuan):

Transfer from local bus to local bus: the second trip is free within half an hour, twice.

Transfer from a foreign bus to a foreign bus: the second trip is charged according to the following interval, and the long-distance bus in South Korea is charged according to the kilometer interval, with a difference of 500 per interval.

Transfer from local bus to external bus: local bus is free.

Transfer from outside the city to the city bus: the city bus is free.