Gu Zhaowu, a modern history enthusiast, woke up and found that he had become an ordinary soldier of the Xuanjia Army during the Zhenguan period of the Tang Dynasty. Accompanying him through time is a mysterious "Book of Merits". This merit book is bound to the entire Xuanjia Army. As long as the Xuanjia Army obtains meritorious deeds, Gu Zhaowu can obtain points and unlock technologies that transcend the times, from horseshoes to steelmaking to gunpowder formulas. Facing the Turkic cavalry in the north and the treacherous situation inside, Gu Zhaowu decided to use this golden finger to build the Xuanjia Army into an invincible steel army, leaving a mark in the history of the world.
