Happy Donkatsu is a restaurant in Hongje-dong, Seodaemun-gu, Seoul, that serves Western-style donkatsu. Its donkatsu sauce is moderately sweet and salty, and it also serves donkatsu spaghetti and pasta with a thick sauce. The mixed set meal lets diners choose donkatsu, hambak, and fish cutlet together, and the owner couple greets guests warmly. The interior and atmosphere are ordinary.