An expelled boxing champion, who now is a high-school teacher, witnesses intolerable violence and throws her first punch to build justice against...

Hyeon is troubled by Seong-goo's ignorance; So-yeon receives a wedding invitation from her ex-boyfriend; Min-jeong, fights and fights with family...

Hyun, Sung-gu and Min-cheol, who decided to do group projects at Min-cheol's house. Hyun hates senseless Sung-gu.