The drama takes place in republican era China in Hengshan Hospital, centered primarily on the conflict between the Communist Party and the KMT in 1930s Shanghai.
Ma Tian Ming is a faithless, greedy, and selfish man who makes his living by cheating and lying. A coincidental accident drags Ma Tian Ming into a case in which he becomes the suspect. Trying to escape, he impersonated the chief doctor of Hengshan Hospital, Cai Li Kun. However, Ma Tian Ming soon found out that Cai Li Kun is a member of the underground Communist Party.
A yin and yang master transforms into a cat and finds herself in the arms of the handsome Qing Moyan of the Dali Temple.
Ru Xiaolan (Hu Yixuan) is a young woman from the modern day. Through a series of circumstances, she travels to the ancient times as a cat. Purely by chance, she meets Qing Moyan (Xu Kaicheng) who's suffering from a poison and as they kiss, they realize that they've found the solution to each other's complications. Deciding to stick together for their own gain, the two embark on a journey to find the five-colored stone that can break Xiaolan's curse and the ghost grass that can cure Moyan's affliction.
Northern Song Dynasty Bianjing's supernatural catcher Shen Shi Wu, a highly trained constable with a cold appearance, not only looks handsome but is also a technical and technology nerd. He is deeply interested in technology and has a large number of fans. Like a god, he has contributed to the maintenance of the social order in Bianjing, but the most troublesome thing for him is the street gangster Liu Xing Yu, a cheat and master in seducing girls.
Constable Shen is engaged to talented artist Wang Shi Shi but falls in love with her alternate identity Yue'er. At the same time, delinquent Liu also falls for Wang. Despite the complications, they work together to fight against evil forces and solve all kinds of strange cases in the area.
