Old Gyeongseong Sundaeguk Dongbaek Yundullae Branch is a sundae-guk restaurant in Giheung-gu, Yongin. It serves sundae-guk with native sundae, head meat, and offal, and also sells suyuk. Visitors can stop by after hiking Seokseongsan or order takeout. The dining area is clean and side dishes come with the meal.