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.

After Yoo-ri's death, Gyeo-re is arrested and linked to drugs. Nam Wan-sung asks Mi-ran to handle the case, but she appoints Dong-jae instead. Wan-sung begs Dong-jae to clear Gyeo-re, but he refuses. Dong-jae uses CCTV footage to reveal stolen drugs.