A knock on the door at midnight is both a curse and an invitation - a terrifying carnival that spans life and death, connecting reality and urban legends. Folklore volunteer Jiang Zhoulin accidentally got involved in a mysterious murder case in a small town due to a sleepless night while posting online. The case appears absurd, but gradually evolves into a supernatural disaster with multiple threads, humor and horror. As good partners, humor anchor Chang Xin, and cold-faced forensic doctor Bai Xiaoyun were gradually involved, everyone discovered that this town had hidden taboo rituals and missing persons mysteries that spanned decades. Everyone is looking for answers between fear and the unknown, and the secret of the midnight knock on the door points to the ultimate truth about family, curse and redemption...
