During the Song Dynasty, a strange case occurred in Kaifeng. Seemingly ordinary civilians died from the strange poison of the Miao border. Witnesses were killed one by one, and clues were often broken. Kaifeng Mansion sent two guards to investigate the case thoroughly. These two people are Zhan Zhao, who is known as the "Royal Cat" from the Holy Father, and Bai Yutang, who is known as the "Golden Mouse" in the world...