Su Yan traveled back to the Han Dynasty and became his ancestor who was about to be exiled and executed.
In order to preserve his "existence", he must change his destiny against nature.
Using the knowledge of later generations, he became the most trusted "auspicious maker" of Emperor Wu of the Han Dynasty.
When the wheel of history rolled by, Su Yan discovered that he had changed not only the fate of his ancestors, but also the national destiny of the entire Han Dynasty.
Until one day, Emperor Wu of the Han Dynasty pointed to the history book and asked him: "The 'Su Yan' written on it, is it you?"