Haengdang Sundae Guk is an old sundae guk restaurant inside Haengdang Market in Haengdang-dong, Seongdong-gu, Seoul, selling sundae guk and suyuk. The sundae guk comes with a heavy broth and menus of orori, ppolsal, and offal, and a mixed suyuk is also served. The naejang sundae guk contains gopchang and meat together and is seasoned with salted shrimp, and at lunch you may have to share a table. The shop is small with few tables, so during meal times it is hard to sit down right away.