First opened in 1937, Cheong Jin Ok has stayed in the hands of one family for the last three generations and continues to serve up one of Seoul’s best Haejungguk (hangover soup), 24 hours a day.Whilst the recipe for hangover soup varies with each dispensary, Cheong Jin Ok are traditionalists and pack theirs full of sunji (congealed cow’s blood), plenty of tripe and a good helping of miscellaneous intestines. The soup is served with a delicious beef broth that spends a good 24 hours simmering during its preparation.