Oreno Katsu Seongsu Main Branch in Seongsu is a specialty restaurant that serves thick donkatsu. It offers basic, spicy, and cheddar cheese donkatsu along with cold memil. The Oreo set meal comes with noodles or udon. The donkatsu has no meaty smell and is tender, the cold memil is chewy, and the cheddar cheese donkatsu has a lot of cheese and is on the greasy side.