Season 2

A haunting transmission bridges two detectives across twenty years, connecting present-day investigators with their predecessor through an old walkie-talkie called Signal. As they piece together a decades-old cold case, the line between past and present blurs dangerously. Each revelation deepens the emotional weight—solving the crime means confronting sacrifices made and lives altered forever. The question becomes not just who committed the crime, but whether changing the past can heal the present.