A woman gets murdered. Choi Kyung Rok, who got out of prison 2 months ago, is arrested as a prime suspect in 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 uneasy about the integrity of his partner.