There was a man named Zheng Hanqing in the Jin Dynasty. One day when he was a child, he was playing by the sea and heard an old man looking at the sea and saying to himself: Nothing in the world can fill this sea. Zheng Hanqing said: Only my future fame can fill this sea.

Later, Zheng Hanqing worked hard, became an official, and was honest and clean, which was well known all over the world.