Seongsimgak is a Chinese restaurant in Donam-dong, Jeju. Its bokkeum jjajang contains squid, shrimp, bamboo shoots, pork, onion, cabbage, and wood ear mushroom, while its samseon jjamppong gets its broth from mosi clams and mussels. The restaurant draws a lunch crowd and also serves people in the evening, and its tangsuyuk is fried to order. When customers gather at once, orders can be delayed.