In the Song Dynasty, there were rich people, and the city walls were raining. Their son said that if they didn't build it, they would steal their neighbor's father and die.

There was a rich man in the state of Song. The wall collapsed because of the heavy rain. His son said, "If we don't build it quickly, thieves will definitely come in." The old man next door said the same thing. (But rich people don't listen. I really lost a lot of property that night. His family admired his son's cleverness, but suspected that the old man next door had committed theft.