Kkulkkul Jinsundae Gangdong Branch is a Korean restaurant in Seongnae-dong, Gangdong-gu, Seoul, serving sundae-guk and plate sundae made with Hanwoo sagol. The Hanwoo sagol broth is milky and thick, and turns spicy when the dadegi is added. Even on weekday evenings there are many customers, so a wait forms at times, and a fried egg comes as a service. The offal inside the sundae-guk is on the dry side.