We went to the tax refund counter at Woori Bank in Myeongdong to claim our cash back.Only to realise there are more tax refund companies in Korea now! This map was pasted on the glass panel at the counter to show the location of the other 3 tax refund companies, whereby you can claim your cash refund in downtown Seoul. Very useful indeed. I'm sorry that my picture is too blur but just FYI. Just remember that you still need to go to the Airport custom to have your forms endorsed, otherwise the money will be deducted back from your credit card.