Mandujak Mandujak is a dim sum restaurant in Seoul that serves xiaolongbao, sun saeu shumai, and saeu buchu donyuk mari. The wrappers are thin and moist, and the dumplings are steamed to order, so the xiaolongbao can only be eaten in the store. The store has four tables for four people and uses prepayment, and many customers order takeout. Prices are on the high side for the portions.