"Blood Shadow Pavilion" is not only an assassin organization in the Jianghu, but also the eagle dog of the Xuan Kingdom in the north. In the 20th year of Beixuan Zhenglong's reign, the first killer of the Blood Shadow Pavilion was undoubtedly killed. The "Secret Division" of the Southern Qian Kingdom's espionage organization wanted to find out the five spies lurking in the Southern Qian Dynasty, so they found Ye Guzhou, a young pharmacist who had been wandering in the countryside, because he was Duan Guzhou's long-lost brother who had not seen him for eighteen years.
Under the pressure of Xu Lang, the commander of the "Secret Operations Division", Ye Guzhou, a rookie spy who had undergone simple training, returned to the Blood Shadow Pavilion as Duan Wuwei. In order to survive, he must live with his sister-in-law day and night, must withstand the overt and covert tests of the master of the "Blood Shadow Pavilion", and must obtain the list of five Xuanguo spies within the specified time... But God does not seem to have mercy on him. The "Four Elephant Jade Screen" related to the Holy Seal of the former Emperor Wu reappeared in the world, and this was the beginning of his treading on thin ice.
In order to find the "Four Elephant Jade Screen", Emperor Xuan ordered "Duan Doubi" from the Blood Shadow Pavilion to search for it. At the same time, he sent Shaoqing Shangguan Ze of the "Imperial Appraisal Department" to assist. Ye Guzhou's junior sister Chu Linglong also accidentally got involved, and later there was another "love-chasing warrior" Han Ling'er. In this regard, Ye Guzhou, Shangguan Ze, Chu Linglong and Han Ling'er formed a detective team with their own concerns. Finally, after a series of treacherous cases, the "Four Elephants Jade Screen" was finally gathered, but the truth about the Holy Seal of the former Emperor Wu was also discovered...
