On the eve of the defeat and execution, Xie Jin beheaded the enemy prince with one sword, staining the execution platform with blood, and the whole country was in an uproar. He is not a traitor, but an orphan from the previous dynasty who has been buried for twenty years. And the prince's sister Shen Zhao is lurking deep in the court, trying to overturn the beam with a poisonous blade. When the keys to the military talisman, the secret files of the palace, and the old grudges of the dead soldiers emerged one by one, a bloody chess game spanning the border and the imperial city quietly began - who of them is the real prey?