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.
신혜선
as So Si-min
이준영
as Han Su-gang
박정우
as Ko Jin-hyoung
박혁권
as So Young-taek
차청화
as Lee Jae-gyeong
이찬형
as Lee Gwon-joong
Bae Hyeon-jun
as Byeong-jin
차우민
as Lee Moon-gi
Kim Sang-woo
as Park Jung-ho
Lee Tae-hee
as Kim Jeong-gyu
Lee Tae-gyun
as Byun Jae-hyeok
Kang Anna
as Song Eun-gyo
