Zhao Yue, a modern history enthusiast, accidentally traveled through the museum to a troubled time similar to the Zhao Heng period of Jingkang in the Northern Song Dynasty, when foreign cavalry invaded the country and the city was in danger. The imitation gun model he carried with him turned into a real gun after traveling through time, becoming his life-saving talisman in the cold weapon battlefield. From the initial confusion to the gradual adaptation, Zhao Yue relied on his memory of historical trends and basic scientific knowledge that transcended the times (gunpowder improvement, simple workshop construction, city defense innovation, etc.) To gradually grow from an ordinary soldier to a key figure influencing the war situation. He not only has to face ferocious foreign attacks and internal factional strife, but also balances the conflict between modern thinking and ancient ethics. In the tempering of blood and fire, he tries to open up a different way of life in this precarious era.
