Byun Jae Wook is a short-tempered prosecutor with a propensity for violence, famous for his tough investigations and who only pursues the truth. When a suspect under his interrogation is found dead, Jae Wook is arrested, falsely accused of murder and imprisoned for 15 years .While in jail, he plans out his revenge mission and finds the most talented criminals in the ward to help him out. Five years later, Jae Wook meets good-looking, brilliant con artist and schemer Chi Won in prison.Feeling he could carry out his plan outside of prison, Jae Wook gets Chi Won acquitted, using his knowledge as a former prosecutor. Jae Wook’s ragtag team of ex-cons will now enact a revenge plan against the organization that framed him.