It’s summer, and the whole Kim family has gathered in Daegu for the ancestral rites. This includes Seong-jin, the eldest grandson of the family, whose father has taken on the family business: a tofu factory. After the rites, family tensions start to rise and Seong-jin drops the bombshell that he won’t be taking on the family business.

A talented martial artist who can't walk past a person in need unites with a probation officer to fight and prevent crime as a martial arts officer.