Gwangjang Market Legendary King Mandu is a dumpling shop on the north side of Gwangjang Market in Seoul. It steams shrimp gyōza, meat mandu, and red bean steamed buns on site, and takeout is available. The shrimp gyōza comes out a few minutes after ordering, and English service and card payment are available. There is no indoor seating, only two small tables on the street.