The ancestors who stayed in Hou were Koreans. Sean once walked unhurriedly on the bridge of Xiapi. An old man dressed in coarse cloth came to Sean's place, threw his shoes under the bridge, turned to Sean and said, "Young man, go down (to me) and bring them up!" Sean was so surprised that he wanted to hit him. Because he was old, he tried to hold his breath and walked off the bridge to get his shoes. The old man said, "put your shoes on for me!" " Sean helped him bring up his shoes and put them on respectfully. "。 The old man put on his shoes and left with a smile. Sean was very surprised and watched him leave. The old man walked nearly a mile and then turned back. He said to Sean, "This young man has a bright future and can teach you his skills. Meet me here at dawn in five days. Sean was very surprised. He knelt down and said, "Good. "Five days after dawn, Sean went there. The old man is already here, and (he) said angrily, "(you) are dating the old man, and you are slower." Why? " After he left, he said, "Come and meet early in five days. "When the rooster crows in five days, Sean will go there. The old man has been here first, and (he) said angrily, "(you are slower than the old man), why?" After he left, he said, "Come back early in five days. Five days later, Sean arrived there before midnight. After a while, the old man came and said happily, "It should be like this. "(The old man) took out a book and said," (You) can become the emperor's teacher after reading this. In the next ten years (you) will establish (a career), and in the thirteenth year you will see me in Jibei, and Huangshi at the foot of the ancient city mountain is me. " He left without saying anything and never appeared again. The next day (Sean) read this book, which turned out to be The Art of War. Sean was surprised and often read again and again.