"Sinseon Seolleongtang is a local chain that specializes in seolleongtang soup, a milky broth that gets its subtle, soothing flavor from simmered ox bone. When combined with tender beef brisket and sliced green onions, the soup is the ultimate comfort food. The origins of seolleongtang are in dispute—some believe it evolved from the boiled beef with scallions dish eaten by ancient Mongolian invaders, while others argue it came from an 11th-century king, Seonjong, who, after sacrificing a cow, wanted to feed a large number of subjects with the least possible ingredients. Either way, the 24-hour Sinseon has remained a go-to since 1981 for locals seeking a satisfying breakfast, lunch, dinner, or hangover meal."