At the end of the Western Han Dynasty, there was a young man named Cai Shun, who had lost his father since childhood and lived with his mother. Because Wang Mang usurped the throne and caused chaos and famine in various places, Cai Shun often went to the wild to feed his mother. Once, he went out to pick mulberries and met a thief with red eyebrows. The thief saw him divide the collected mulberries into two baskets and asked him curiously why. Cai Shun said: "The black mulberry is ripe and tastes very sweet. It's for mother. Red mulberries are immature and sour, and they are for themselves, so they will be packaged separately. Deeply moved by Cai Shunxiao, these thieves gave him three barrels of white rice and a cow and told him to go back and feed his mother.