Ojangdong Heungnamjip Main Branch is a naengmyeon restaurant in Ojangdong, near Euljiro 4-ga Station, that serves Hamhung-style cold noodles. The menu offers hoe naengmyeon, meat naengmyeon, and mixed naengmyeon combining both, with noodles made from sweet potato starch and seasoning that is not spicy. Orders and payment are made in advance, and hot broth is served once you sit down. Lines form at mealtimes, but the tables turn over quickly, and the portions are small.