Ling Yue, a modern armory administrator, traveled through space with a load of heavy weapons and supplies in a warehouse accident, and became an abandoned orphan girl in the northern border of the Dajing Dynasty. At this time, the northern border is full of wars, the court is corrupt, and the grassland barbarians are around. Relying on space materials and modern knowledge, Ling Yue started by gathering refugees and forming armed forces, blasting the barbarian cavalry with artillery, and using machine guns to clear away the thorns of troubled times. On the way, they met Jun Chengyu, the seventh prince who was on an incognito investigation. One was an iron-blooded heroine with a "magic weapon" in hand, and the other was a deep-tempered prince who forbeared and sought power. From testing each other to fighting side by side, she helped him clear the emperor's side and put down the rebellion. He protected her to break the rumors and secure the northern border. In the end, tempered by iron and fire, they jointly walked a path to rule the world.
