This code comes from the biography of Wang Xizhi in the Book of Jin.
Wang Xizhi (AD 32 1-379) was a famous calligrapher in Jin Dynasty. He was once a right general, and people called him "Wang Youjun".
Once, Wang Xizhi came to a primary school student's house and was very excited to see the smooth and clean wooden box of Fei (Fě i). He wrote on it, half of which were real books (that is, block letters) and half were cursive. Later, these words were scratched by the pupil's father. The pupils were shocked and regretted it for several days. On another occasion, Wang Xizhi saw an old woman selling a hexagonal bamboo fan in Lushan Mountain (the name of Lushan Mountain, in the northeast of Shaoxing County, Zhejiang Province). Wang Xizhi wrote a fan for her, and five words were written on each fan. At first, the old woman's face showed displeasure. Wang Xizhi said to the old woman, "Just say that it was inscribed by Wang Youjun, and each piece can be sold for 100 yuan." The old woman did as he said, and as a result, people rushed to buy her fans. A few days later, the old woman brought another fan for Wang Xizhi to write. Wang Xizhi smiled and said nothing. Wang Xizhi's calligraphy has been valued by the world to such an extent.