Playing Strategist in Later Tang

On the eve of the war to destroy the Liang Dynasty during the Tongguang era of the Later Tang, Gu Yan, a conscripted grain transporter, narrowly escapes execution by uncovering the secret of a Liang army spy through an old copper button. He discovers he has a strange ability—by touching hidden secrets, he can read residual memories. The cost is nosebleeds, headaches, and the danger of being targeted by those in power. Li Siyuan, the deputy commander of the Fan-Han cavalry and infantry, takes him in as a 'spike.' But in this military camp, some want to use him, some want to kill him, and some want to uncover his origins through him—while Gu Yan himself doesn't know who the body he occupies truly is. In the Five Dynasties and Ten Kingdoms period, human life is as fragile as grass. He must survive among the blades and, while alive, figure out one thing: who am I really? — Description from novelcodex.org