Hi, the combination ticket is 10000won to visit 4 palaces (Gyeongbokgung, Changdeokgung (the Secret Garden included), Changgyeonggung, Deoksugung) and Jongmyo Shrine. However, I have an ISIC card that will entitle me 50% off the entrance fee to Changdeokgung, Changgyeonggung and Deoksugung. If I were to visit Changdeokgung (the Secret Garden included), Changgyeonggung and Deoksugung and flash my ISIC card when buying the tickets, how much will it cost me? Is it more worth it to just buy the combination ticket or use my ISIC card to buy 3tickets to the palaces I want to visit? Thanks.