An expelled boxing champion, who now is a high-school teacher, witnesses intolerable violence and throws her first punch to build justice against it, while putting on a mask.
Shin Hye-sun
So Si-min
Lee Jun-young
Han Su-gang
Park Jung-woo
Ko Jin-hyoung
Lee Chan-hyeong
Lee Gwon-joong
Park Hyuk-kwon
So Young-taek
Cha Chung-hwa
Lee Jae-gyeong
Son Sook
Jin-hyoung's Grandmother
Bae Hyeon-jun
Byeong-jin
