Han Xin, a doctor of history, was transformed into a down-and-out aristocrat with the same name in the late Qin Dynasty. He knew Xiang Yu would lose and Liu Bang would win, but no one believed him. So he began to write letters to various princes, in which he predicted in detail the direction of the war in the next three years. He sealed each letter and wrote "Open in three days." Three days later, the predictions in the letter came true one by one. The princes went crazy and sent people to look for him. He just smiled: "Tell Liu Ji that I have a way to make him emperor, but I have a condition - I want to become a general."
