Ran Kalguksu is a kalguksu restaurant in a building behind Exit 1 of Seongsu Station in Seoul. It serves kalguksu and kongguksu, with chewy noodles in a savory broth mixed with egg and geotjeori kimchi on the side. The kalguksu portions are large, and sides such as kimchi jeon and pajeon are commonly ordered alongside. The kalguksu broth is on the salty side.