Kaifeng Mansion took over a case in which a woman with fireworks was murdered, and Yumao Zhanzhao went to the brothel to investigate. The case is confusing and there are many clues that need to be verified. One of the deceased's belongings is inadvertently related to his childhood sweetheart Shui Jiping, who he left without saying goodbye three years ago. No matter how time flies, the bond buried between them cannot be erased. The previous murder case has not yet been solved, but another disaster occurred in Beijing, where the former Song and Xia border generals colluded with foreigners. It just so happens that in this troubled time, more and more people are constantly being involved. Chinchilla Bai Yutang, Zhan Zhao's close friend Pao Ze, and even Dali Temple, which maintains legal justice, are involved in this "Zhenlong Chess Game" where conflicts and disputes abound. Zhan Zhao is torn between love and law, enemies and friends, but he has to stick to his bottom line. However, there are more and more people from all walks of life who are making trouble for him. They are all unable to cut it off, and they are still messy. The knife cuts off the water and the water flows, causing disasters one after another. But why did the clues he traced gradually move closer to Master Pang and Xixia? Could it be that Anlehou, whom Zhao Zhen valued, really colluded with foreigners and had evil intentions? How should Zhan Zhao and Wu Shu face such a vast sea of floating rocks and endless wars?