Ilsong Kalguksu is a noodle shop next to Sungkyunkwan University in Seoul, serving bajirak kalguksu, dak kalguksu and jang mandu guk. The broth is made spicy with pepper and chili, and potato jeon and mandu can be ordered alongside. The shop gets crowded at mealtimes, has parking beside the building, and uses domestic ingredients. The clams are not fully purged of sand and the portion of noodles is small.