Shake Shack Yongsan I'Park Mall is on the first floor of Yongsan I'Park Mall, connected to Yongsan Station, and sells hamburgers. It serves the ShackBurger, Chick'n Shack, and vanilla shakes, with fries and beer as additions. The store is spacious and tables turn over quickly, so seats open up even when it is crowded. The burgers are on the salty side, so eating them with cola still leaves you thirsty.