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.

Yoon-young, a 19-year-old girl who dreams of becoming a civil servant, is framed as a murderer and imprisoned in a women’s prison.

At his mother’s 70th birthday party, Yong-nam runs into Eui-joo, who rejected him in college. When the city is engulfed in toxic gas from a terrorist attack, the two must…