Special soldier Zhao Ge traveled to the border of the Zhou Dynasty and became a military household with no food to eat. The border troubles here are serious and the armaments are weak. With his modern military training methods, he has managed to train a bunch of ragtag men into elite iron cavalry that can shake the world. He and the demoted general's concubine Gu Changfeng went from being hostile to each other to relying on each other for life and death. He took the military doctor Su Wantang and the veteran Shen Tieshan to fight and build while dealing with the secret temptation of the prince Han Jingxi. But the border was stabilized, and the whirlpool in the court rolled in again. Zhao Ge discovered that the world was far more than just war.