Modern intelligence instructor Shen Zhao traveled through time and became a border deputy general who was falsely accused of treason. He handed over the enemy's secret letter backhand, shocking the entire army. Xiao Yan, the head of the Secret Service, was ordered to trace the truth, but discovered in bloody battles that Shen Zhao was not only a traitor, but also the only person who could crack Beidi's conspiracy. Veteran general He Changfeng hides his old army, female counselor Liu Yuan sets up a trap step by step, firearms commander Zhao Tieyi and imperial envoy Su Yuheng each have their own agendas - it is difficult to distinguish between loyalty and treachery, and people's hearts are the battlefield. Shen Zhao used a secret letter as a blade to tear apart the rotten bones of the dynasty; Xiao Yan used half-life hatred as a shield and finally knelt down for the truth. This is not a cleansing of grievances, but the beginning of changing the world.
