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.