In the middle and late period of the Daning Dynasty, the imperial power fell to the side, civil servants formed cliques for personal gain, and local powerful forces separated themselves. The Jin Yiwei, who were the emperor's personal soldiers, had long been corrupt, and there were many internal factions, and the Tiqi at the bottom were like grass. Lu Chen, a member of the Jinyi Guards, was treated as a scapegoat in his previous life for trusting his superiors. Shen Qingqiu, whom he desperately protected, also died in front of him. Lu Chen, who died with hatred, was unexpectedly reborn and returned to the night before his boss Qian Baihu was about to silence him. With all the memories of his past life and the knowledge of modern criminal investigation, Lu Chen knows all the secrets of power changes and conspiracies in the next thirty years. This time, he will never make the same mistakes again.