Dongsungak is a Chinese restaurant that opened in 1975 in the back alleys of Yeongdeungpo Market in Seoul. Its signature dishes are ganjjajang and old-style tangsuyuk, with the tangsuyuk sauce served on the side for dipping. Inside, wooden tables and old interiors keep the atmosphere of the 1970s. The restroom is a narrow old-style squat toilet with no lock.