Bukchon Son Mandu Insa Main Branch is a mandu shop next to the Ssamzigil side gate in Insadong. It serves modum mandu, eolkeun mandu guk, and pi naengmyeon, and mandu are steamed continuously in the steamer out front. You order outside first, then sit when a seat opens up, and the food comes out quickly. The seating is narrow, so people sit close together.