Beef bones simmered 24 hours, finished with cabbage, tripe, and seonji (beef blood pudding). Open early, packed with morning-after office workers. Anchor of the historic Cheongjin-dong haejangguk alley in Jongno. Cheongjinok has served haejangguk in Cheongjin-dong since 1937 and was designated a Seoul Future Heritage in 2013.