The Legend of Zhu Xian in the Three Kingdoms

In the contentious late Eastern Han Dynasty, the heroes of the Three Kingdoms rose up together in troubled times! Among them there are many people who cultivate immortality such as Zhang Jiao and Yu Ji. Why do they appear? Maybe there is a bigger conspiracy behind the chaotic times of the Three Kingdoms, which are also called the strong times? The Rebellion of the Eight Kings? Wuhuanhua? Why was there such disaster after the end of the Three Kingdoms? The world is prosperous, and only the way of heaven can answer it!