Han Xin was a famous military commander in ancient China. He was born in poverty and lost his parents at an early age. Before the army was established, Han Xin was neither engaged in business nor willing to farm, and had no property at home. He often leads a life of poverty and discrimination. He has some friendship with a local official, so he often goes to the official's house for free meals, but over time, the official's wife dislikes him.

In order to survive, Han Xin had to go fishing in the local Huaihe River. An old lady who washed clothes saw that he had no food to eat, so she gave him the food she had brought. For dozens of days, Han Xin was very moved and said to the old lady, "I will repay you well one day." The old lady was very angry and said, "You are a man and you can't support yourself. I feel sorry for you. I only give you food. Who else will?

In Huaiyin, Han Xin's hometown, some young people look down on Han Xin. One day, a teenager saw that Han Xin was tall, but he often wore a sword. Thinking that he was timid, he stopped Han Xin in the downtown area and said, "If you have courage, draw your sword and stab me; If you are a coward, go under my crotch. " Everyone present knows that this is a deliberate act of finding fault and humiliating Han Xin, and I don't know what Han Xin will do. See Han Xin thought for a long time, said nothing, and then got under the man's crotch. Everyone present at that time laughed and thought that Han Xin was a timid person who was afraid of death and had no courage. This is the story of "legs being humiliated" handed down later.