In Shanhai, where humans and monsters coexist, Luo Tian, a junior police college freshman, was tested by the chief of the cute animal club Fang Xia in order to join the detective agency to earn extra money. The investigation was disguised as The suicide murder was thus embroiled in a series of bizarre cases. Luo Tian and his friends who joined the detective agency successively unveiled a huge conspiracy hidden in Shanhai City, brewing between humans and monsters.