In the 1920s and 1930s, Shanghai was dominated by foreigners, compradors and wealthy businessmen during the day, but at night it became the domain of the poor and evil spirits. People's hearts are not ancient, the world's customs are withered, laws are loose, and evil spirits are everywhere. Only the great detective Gu Shen, with eagle eyes like a torch, chivalrous and courageous, dedicated to serving the people, is selfless and courageous, has repeatedly solved strange cases, and has become a legend in Shanghai and a ray of light in troubled times.
