This book records the period of China from 406 B.C. when the three families were divided into Jin to 221 B.C. when the King of Qin became the First Emperor.
The male protagonist, Li Xiang, traveled through the troubled times of the Warring States Period and helped the weak Qin State achieve the great cause of unification.
He was an elder of the seven dynasties, but he had never aged.
He invented the flintlock, and the cannon accelerated the war of unification in Qin.
Qin Huiwen, Qin Wuwang, Qin Zhaoxiang, Qin Shihuang, and the other kings of Qin were all taught by the protagonist.
From the time Duke Xiao of Qin put Shang Yang in an important position and started the reform, to the time when Qin was finally unified.