Gyukatsu Jeong Seongsu is a Japanese restaurant in Seongsu, Seoul, serving gyukatsu, tendon and curry. The gyukatsu set meal can be ordered with side dishes, and rice can be refilled. There is a wait even at weekday lunch, and customers register for the wait at the storefront before ordering at a kiosk. The restaurant is on basement level 1, where ventilation is poor.