The first emperor of Qin, Ying Zheng, died out of hatred due to Xu Fu's misfortunes. In order to make up for his mistake, Master Xu Fu spent 800 years collecting his soul and helping him to be reborn as Qin Zheng, a young man of the Tang Dynasty. After the rebirth, Qin Zheng met Li Shimin in the army. The two had similar goals, recruited talents together, and got involved in the power struggle in the palace. After they experienced the Xuanwumen incident together, Li Shimin ascended the throne and started the Zhenguan rule. After that, Qin Zheng and Li Shimin made a four-year agreement to alternately govern. When Li Shimin was in power, he did light corvee and low taxes, recuperated and recuperated, and created a prosperous age; when Qin was in power, he actively conquered and expanded territory. In the succession of rulings, the Tang Dynasty developed in an all-round way in politics, economy, culture, military and other aspects, and its territory continued to expand. After many rounds of four-year agreements, the world was finally unified under the leadership of Qin Zheng. The two worked together to create a huge empire with unprecedented prosperity and diversification.
