Tao Shaozhong, a scholar from Lin'an, hides in his body the "Linglong Heart", a century-old sacred object of the demon world, but he is forced into a desperate situation by the demon Ahli who takes the form of a little civet cat. She threatens to steal the heart and ascend to heaven, but she is forced to form an alliance with him in the murder case of "cat demon causing trouble". Ah Li uses demon power to sniff out obsessions, and Tao Shaozhong uses demon-killing blood to solve the mystery. From the case of poaching the heart of the Embroidery House to the puppet robbery in the theater, every murder case actually points to the old grudge of the "Demon Slaying Order" a hundred years ago. When they got deeper and deeper into the conspiracy of the Academy Headmaster, they were shocked to realize that Ah Li's life experience was related to the remnant soul of the Demon King, and the truth about Linglong Heart was actually a symbiosis scam set up by the demon clan for thousands of years. Behind the human-male contract, is it the strangulation of fate, or the glimmer of mutual redemption?
