During the Warring States period, the state of Wei had a son who was very filial to his mother. His mother was timid when she was alive. This son is very filial and never leaves his mother because she is afraid of thunder. As long as it thunders, my son will stay by his mother's side, cover his ears for his mother and comfort his mother softly. "Don't be afraid, my son will stay by your side."

Later, the son's mother passed away. Many people advised this filial and learned son to seek official wealth. The man still refuses to leave. He buried his mother in land of silence, near his home. Whenever he heard thunder, he flew to his mother's grave, stroked the tombstone tightly and said to his mother, "Mom, please don't be afraid, my son is here to accompany you and protect you!" "