Dukki Thao Dien is a tteokbokki buffet on the fifth floor of Vincom Mega Mall Thao Dien, next to the racing cars and set back inside. You adjust the amount of sauce yourself to boil the tteokbokki, and pick from ramyeon, fried items, gimbap, japchae and chicken. It opens at 10:30 a.m., and on a Sunday at 5:30 p.m. the wait was under 10 minutes. The store sits deep inside the mall, so it is hard to find.