In the 1930s, Shanghai was a place of prosperity and debauchery. When people were intoxicated in their dreams, bizarre cases happened quietly in some corner of the city. Qin Xiaoman, a beautiful woman who had just graduated from the police academy, came to the British Concession with the ideal of becoming an outstanding detective. She lived in the Sullivan Apartment and became a neighbor and colleague with the famous police detective consultant Luo Fei, who had repeatedly solved strange cases. At first, the two people had different personalities and became "enemies" as soon as they met, but they had to work together to solve the case by mistake.