Seo Dong-jae, an attorney with a troubled past, is frustrated after missing a promotion. Assigned to a case involving Lee Kyung-hak, he uncovers a conspiracy involving a powerful CEO, and suspects Kyung-hak's innocence.

Dong-jae negotiates with serial killer Lee Kyung-hak. A disturbance leads to Kyung-hak's arrest and Dong-jae's hospitalization. Nam Wan-sung visits Kyung-hak in prison. Dong-jae meets someone from his past.

Six months ago, Nam Wan-sung ordered a witness's disappearance, leading to a case dismissal tied into the present day. Police suspect Dong-jae in an attack at a bar. A plan to catch a drug lord is revealed. Dong-jae faces scrutiny. Yoo-ri is shot.