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

The leader of the nation's most elite homicide squad volunteers to become the head of the lowest ranking squad.

The leader of the nation's most elite homicide squad volunteers to become the head of the lowest ranking squad.

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

The team pivots their investigation and uncovers new information, following Yubin's lead.