A crime unit with the lowest arrest rate gets started on its first case with its new chief, Yubin.

The team investigates a murder disguised as a suicide and gets in a bind as another death occurs.

The team advances the investigation with information from the witness. Yubin identifies the suspect.

A fire breaks out at a fried chicken shop run by Joongryeok's acquaintance.

The team narrows down the arson suspects but hits a dead end. Yubin then proposes a shocking theory.

Following Yubin's lead, the team pivots their investigation and uncovers new information.