A woman gets murdered. Choi Kyung Rok, who got out of prison 2 months ago, is arrested as a prime suspect of a murder case. Detective Han has doubts about Choi Kyung Rok's guilt, because he was only involved in petty crimes before, but his partner Det. Kang tries to close the case as soon as possible.
Det. Han checks his partner's case file and more doubts occur about the case. Det. Han also starts to feel unease about the integrity of his partner. The unease develops in Det. Kang about Det. Han as well. Det. Han then meets senior police officer Jung Jong Doo and they decide to catch the real murderer together .