Wonjo Hamheung Naengmyeon is a naengmyeon restaurant in Seoul that opened in 1953 and serves Hamheung-style cold noodles and mandu. Meat naengmyeon and hoe naengmyeon come with large mandu, and the mul naengmyeon is topped with cucumber and pear. The shop spans the first and second floors, and payment is made before sitting down. During busy hours, the noodles soften or turn lukewarm.