Jeongdon Seongsu is a tonkatsu restaurant in the basement of SM Town near Seoul Forest, serving anshim and deungsim donkatsu and chicken katsu. The donkatsu comes with cabbage salad, side dishes, and rice, and is eaten with tonkatsu sauce, wasabi, lemon salt, and truffle salt. Waiting is registered through the Tabling app, and entry takes about 10 minutes. The interior is clean.