Wei Zhongxian Is an Old Man, How Did He Become the Sworn Brother of Taizu?

A soul from the future traveled through the late Ming Dynasty and became the "9,000-year-old" Wei Zhongxian, and discovered that he had the ability to travel through part of time and space. Isn't this awesome? The first time he traveled back to the Hongwu period, he used "scientific and ruthless work" to defeat Zhu Yuanzhang, and he was recognized as a sworn brother. When Wei Zhongxian appeared in front of Chongzhen with Taizu and a group of late emperors, Zhu Youjian was so frightened that his CPU almost burned out. The Emperor Taizu might not know him, but how could he not know his grandfather and brother? Lao Zhu: "You bastard, do you want to attack our brother? We will destroy you!" Wanli: "The stupid emperor's grandson, the "backer king" is Taizu's sworn brother and our ancestor! Seeing him is like meeting Taizu himself!" Tianqi: "My brother must remember that he is the most trustworthy and reliable person for the descendants of the Zhu family! Where he is, Ming Dynasty will be there!" Zhu Youjian finally couldn't stand it any longer, o(╥╥)o What does Lao Deng mean by "nine thousand years old"? He is simply "nine thousand years old"!