Karstorang Main Branch is a kalguksu restaurant on a back street in the airport-dong resettlement area of Gangseo-gu, Seoul. It serves beef kalguksu, jang kalguksu, and chadol jjamppong kalguksu, boiling the noodles in beef broth and making the jang kalguksu spicy without being harsh. The dining room seats about 30, and rice and sari are free. Parking is limited to four spaces.