Son Kalguksu is a small snack shop in front of the main gate of Soongsil University in Sangdo-dong, Seoul, serving instant tteokbokki, kalguksu, and tteokmanduguk. The signature combination is cheolpan tteokbokki with kalguksu noodles added, the broth reduced slightly, and rice stir-fried in at the end. At lunch it is popular and the menu is varied. Side dishes come with unlimited refills.