Hot (boiled) chicken broth in the stone pot! You'll fall in love with the deep but mild tasty soup that enhancing your vitality. Mostly referred to one of the best Samgyetang restaurants in Korea. The restaurant(as a traditional Hanok) is actually HUGE, so don't be scared by the long line made by both locals and tourists ;)
Traditionally, many Koreans eat hot Samgyetang on three hottest days of the Summer. (Of course, Samgyetang is great for cold weather) It's been a long-time popular restaurant even presidents of Korea used to love.
They'll give you a little cup of liquor made of Ginseng with your meal. A bit strong but try it to give you an appetite.