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In the early years of the Republic of China, Lu Hehuan, the son of the deputy director of the Shanghai Jiuzha Police Station, was transferred from Scotland Yard to work in the Jiuzha Police Station from Scotland Yard in order to reunite with his lover. Unexpectedly, as soon as he got off the ship, he learned that his lover Ling Yan had already committed a murder and was missing... The upright Lu Hehuan was determined to investigate the matter thoroughly, but he accidentally disrupted the promotion of the director Bao Kang and was fired by Bao Kang. Lu Hehuan used Scotland Yard's miraculous crime-solving skills to solve the difficult case of "the head of a female corpse", so he was accepted as a detective by the snobbish and naughty police detective Ying Xi. The two ate and lived together, and for a while they became Huanxi's enemies, and called themselves the "Happy Detectives"... After working together to detect a series of bizarre or ridiculous cases, Lu Hehuan and Ying Xi went from being at odds at the beginning to becoming inseparable. Just as the two were enjoying themselves at the Jiuzha Police Station, Lu Hehuan's long-lost lover Ling Yan suddenly died in his old residence, dressed in blood. Lu Hehuan was devastated... Several ladies from Jiuzha died tragically one after another, and their death conditions were no different from Ling Yan's. Lu Hehuan regrouped and pursued the "Blood Curse" serial murder case. Unexpectedly, he discovered an unbelievable truth and an unforgettable adventure...