Wanchai is a long-running Chinese restaurant in Sinchon Changcheon-dong, Seoul, serving Hong Kong and Sichuan-style dishes. Its signature items are spicy steamed mussels made with heavy oil and red pepper powder, oyster jjamppong, and round tangsuyuk. To find it, look for Sinseol Seolleongtang and enter the small shop on the left inside the alley. Meals are served at tables on the second floor, the spicy mussels are very hot, and the ganjajang and tangsuyuk portions are small.