Founded in 1953, Ojang-dong Heungnam House is the oldest Hamheung-style cold noodle restaurant in Seoul. Its signature dish, hoe-naengmyeon, features chewy sweet potato starch noodles topped with seasoned skate fish and served in a rich beef broth. For over three generations, this restaurant has preserved the authentic taste of North Korean-style cold noodles, making it a beloved culinary heritage site and a designated Seoul Future Heritage.