When Si-mok hears who’s gone missing, he starts gathering clues by going through phone records. Yeo-jin begins her own investigation.

Leading police efforts to locate Dong-jae, Yeo-jin connects the case to that of the dead policeman. Si-mok pays Yeon-jae a visit.

A perplexing photo containing a disturbing message surfaces. The police consider the possibility of the culprit being one of their own.

A witness, who says he saw the kidnapping, steps forward to identify the perpetrator. His claims could mean serious trouble for the police.

A suspect is arrested, but Dong-jae remains nowhere to be found. In the interrogation room, Si-mok and Yeo-jin try to draw out a confession.

Details of the cover-up become public, but Si-mok isn't finished asking questions. The police-prosecutor council is called off.