What are the reclusive high-ranking people encountered by the people?

In history, everyone knows Zhao Yun, the general of the Five Tigers, and Zhang Xiu, who used a gun like a god, but do you know their teacher? When Zhao Yun was young, he liked to dance with a gun and stick, but then there was no martial arts school at all, and even if there was one, there was no money. Occasionally, one day when Zhao Yun was waving a stick at home, he was seen by an old man passing by. At that time, the old man was not dressed luxuriously, so he came and played a few tricks. I didn't expect Zhao Yun to learn it at a glance. So he accepted Zhao Yun as a disciple, and finally made Zhao Zilong, a generation of five tiger generals in the Three Kingdoms period.