KATSUYONGA SUNGSU is in Seongsu, Seoul, and serves Japanese-style tonkatsu and curry. The anshim katsu set comes with naeng somyeon, and the menu also includes applewood-smoked tonkatsu and basil mayo. Orders and payment are made at a kiosk at the entrance, and food arrives in about 10 minutes after you sit at the counter. Rice, soup, and cabbage are refilled for free, the seating is all counter-style, and the basement-level space can feel humid.