There are many regrettable characters in history. The Ziying dynasty of the Qin Dynasty collapsed rapidly, Huo Qubing, the proud son of heaven, Sun Ce died before leaving the army, and Li Yu, the late master of the Southern Tang Dynasty, whose poetry was astonishing, etc.
There is no time travel in this book, and the protagonist has no ability to predict the future. Instead, we use scientific logical reasoning to resurrect Ziying and give him correct decisions. Step by step, he explains how to kill Zhao Gao, retreat from Bashu, conquer Han Xin, defeat Xiang Yu, defeat the Xiongnu, and conquer the Western Regions, so as to re-unify China, shock all directions, and attract congratulations from all dynasties.