Guwol Sibil is a tonkatsu restaurant in Seoul that serves deungsim tonkatsu and cheese tonkatsu. It sits on the back block of Ssangnidan-gil, inside the Ssangmun Station market. The thick cutlets have a thin fried coating and come with salt, curry, wasabi, and tonkatsu sauce. The small space can lead to a wait, and yogurt is served as a dessert.