First, you should get a T-money card to have a free transfer during your Korea trip.
You can get a T-money at the most of convenience store in Korea and there are a lot of design of the card (Korean traditional clothing, LINE character, KAKAO character, or even K-POP stars like EXO and BTS also). You can choose what you want and it costs approximately 2500won ~ 5000won.
Second, you should charge your T-money card at least 1,000 won at a time and up to 50,000 won. As much as you need during your travel. You can also charge your card at every convenience store. But, don’t forget to use cash when you charge! Only cash is available for charging!
Third, if you followed the first and second points well, you can use your T-Money now. We use T-Money to get on the subway or on the bus as well. The transfer system in Seoul is fantastic if you have T-money because you can transfer from bus to bus, from bus to subway, from subway to subway, and from the subway to subway! The transfer is usually free, or it only costs 50 won to 300 won. Convenient transfer and transportation cost savings! It’s like killing two birds with one stone.
Hope you enjoy your Korea trip with these tips!