Hi! I used CashBee card. Bought from the 7-eleven at the airport for 2000 Won if I remember and reloaded 20,000 Won for 8 days (I travelled purely by bus and metro from the airport and back). I didn't have any balance to refund but I kept the card as a souvenir (it has One Piece design on it). However, if you do want to refund, you can do so at any 7-Eleven or Family Mart stores. I believe there's a 200 Won service charge for every 10,000 Won you refund
Awesome thing about using the card for public transport in Busan is that not only do you get a discount on your fare but if you exit a metro and get on a bus within 20 minutes, your bus fare will be discounted by around 80%! Amongst the many cities I've been thus far, the easiest and cheapest to travel was Busan.
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