Gildong Udon Gildong Main Branch is an udon specialty snack shop near Kangdong Sacred Heart Hospital in Gildong, Seoul. Gimbap, tteokbokki, and twigim can be ordered alongside the udon, which is the central menu item. It is open 24 hours, and orders are placed at a kiosk next to the door with food picked up by customers themselves. Alcohol is paid for separately from food.