The film mainly tells the story of a water monster cannibalism incident in Qujiang Lake in Chang'an city. Xue Yang (Li Yan), the head of Dali temple, and Guan Yu (Xu Dongdong), the head of Wuzuo temple, are ordered to find out the truth of the murder. During their investigation, the two found that there were a large number of skeletons and human bones scattered at the bottom of the Qujiang pool, and there was a startling conspiracy related to the stability of the court. The unnamed corpse died tragically in the river. In Chang'an City, rumors of fish demons were everywhere, and several small beggars disappeared one after another, making the case more suspicious. Is the fish monster deliberately raised by the monster Wu yantuo (Yin Ziwei)? The Prince (played by Ma Shuai) sacrifices his mother in the Qujiang lake. Will he be besieged by fish monsters and killers? Why does the mysterious female swordsman (Peng Jing) risk her life to kill Wu yantuo? Which is the loyal and treacherous between Guo Changzhi (Liu Fenggang) and Shen Shu (Yang Yongwen), the Minister of the Ministry of war? The cases in the thriller case are closely linked, and the revelation of the mystery is imminent.

The film mainly tells the story of a water monster cannibalism incident in Qujiang Lake in Chang'an city. Xue Yang (Li Yan), the head of Dali temple, and Guan Yu (Xu Dongdong), the head of Wuzuo temple, are ordered to find out the truth of the murder. During their investigation, the two found that there were a large number of skeletons and human bones scattered at the bottom of the Qujiang pool, and there was a startling conspiracy related to the stability of the court. The unnamed corpse died tragically in the river. In Chang'an City, rumors of fish demons were everywhere, and several small beggars disappeared one after another, making the case more suspicious. Is the fish monster deliberately raised by the monster Wu yantuo (Yin Ziwei)? The Prince (played by Ma Shuai) sacrifices his mother in the Qujiang lake. Will he be besieged by fish monsters and killers? Why does the mysterious female swordsman (Peng Jing) risk her life to kill Wu yantuo? Which is the loyal and treacherous between Guo Changzhi (Liu Fenggang) and Shen Shu (Yang Yongwen), the Minister of the Ministry of war? The cases in the thriller case are closely linked, and the revelation of the mystery is imminent.