Yeomra, the King of the Night, once a loyal assassin for the Righteous Sect, is betrayed by his own and finds himself reborn in the body of Avery, an unassuming convenience store worker. Believing he's been granted a new life of anonymity, Avery embraces the mundane until a fateful phone call shatters his illusion. He discovers he's been a part of a sinister organization of serial killers.