If I Could Do It Again, I’d Choose Li Er

In the twenty-third year of the Zhenguan era, at Hanfeng Hall in Cuiwei Palace on Mount Zhongnan, fifty-two-year-old Li Shimin took one last look at the civil and military officials who had stood by him all his life, then slowly closed his eyes, reluctant to part with them. A force then sent Li Shimin's soul into the bodies of the last emperors of successive dynasties. The System detected that history was about to undergo a major change and began its maintenance protocol. Where would history go from here?