Synopsis：The story took place inside an old city in a fictional universe where the nights were plagued with evil beings. As several members of the imperial family and public officials were mysteriously killed in succession, the Emperor was enraged and ordered Yan Li, a royal monster hunter, to use his life a wager and ensure that he’d solve the pending case within three days. Facing pressure from all sides and challenges from spy agencies, Yan Li was forced to risk everything in a battle of wits and will with demons. As the truth drew near, the stakes also grew higher and Yan Li became embroiled in a fight between humans and demons that greatly impacted his life, his reputation and his love.