Si-mok turns his attention to an unusual case involving the sudden death of a former prosecutor, and finds that nothing quite adds up.

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

Taken off the case, Si-mok and Yeo-jin return to their work on the police-prosecutor council. Tae-ha and Bit head to a sensitive meeting together.

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.

While getting to the truth about the night of the attorney's death, Si-mok and Yeo-jin learn about the involvement of a mystery person.

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