For example, Zhu Yuanzhang, as the founding emperor of the Ming Dynasty, had long heard of Zhang Sanfeng's name, so he sent someone to Wudang Mountain to invite Zhang Sanfeng, hoping to ask Zhang Sanfeng some ways to live longer. But Zhu Yuanzhang sent someone to invite Zhang Sanfeng and Zhang Sanfeng to go out of town twice. So I didn't meet Zhang Sanfeng until Zhu Yuanzhang died.