In the seventeenth year of Jian'an, on a cold night, the blood moon appeared in Xuancoff Gorge.
Shen Yanzhi, the deputy envoy of the Xuanjia Guard, investigates the case of smuggled salt, but is involved in the "Reverse Scale" dispute among the twelve ebony coffins - the legendary real dragon Reverse Scale hidden in the twelve golden men is actually closely connected with the murder case of the Jingnan Palace and the conspiracy of the royal family to seize the heir. He encounters Xiao Yan, the evil star of the Jianghu world, and the two are forced to make a "blood pact" because of the bronze secret scroll, sharing pain and destiny.
On the surface, it is a game between the imperial hawk and the evil cultivator, but in reality it is the fateful collision of twin brothers: Shen Yanzhi was burdened with the blood of the family, but he recognized the thief as his father and became the sharp sword of the royal family; Xiao Yan endured the humiliation and burden for three years, stirring up the world in the name of "Blood Hand Massacre", just to uncover the truth about the Queen's massacre of the Jingnan Palace for the blood of the "Dragon-Eating Gu".
As an army of living warriors emerged from the ruins of Jingnan Palace in Jinling City, the two discovered that all the conspiracies pointed to the ultimate secret of the "Dragon Bone Reverse Scale" - only by gathering twin bloodlines can the power of the Reverse Scale be activated, and their sister Shen Qinghe (Xiao Yan's late wife) was actually the "key" who voluntarily sacrificed herself back then. The side effects of the blood contract caused Shen Yanzhi to constantly dream about the fragments of his sister's death, and he was shocked to realize that her death was not caused by Xuanjia Wei, but by a borrowed knife plot by "Tianji Pavilion".
When the prince, queen, and Tianji Pavilion gathered in Jinling, Shen Yanzhi and Xiao Yan were forced to choose between "loyalty to the court" and "blood revenge." The red line of the blood contract is getting tighter and tighter. One wants to destroy Ni Lin to end the royal ambition, and the other wants to hold Ni Lin to reshape the order of the world. However, when the swords are facing each other, they discover the "Ni Lin" birthmarks on each other's palms - they are the real "dragon bone vessels", and the sister uses her life to
