Who is the origin and protagonist of the idiom "Riding a donkey to find a donkey"?

Who is the origin and protagonist of the idiom "Riding a donkey to find a donkey"?

Once upon a time, a man named Wang San drove five donkeys to the market. After walking for a while, I thought: Why not ride a donkey? So he rode on the back of the donkey. On the way, he suddenly thought of counting donkeys. Just point to the donkey and count "one, two, three, four", but there are always only four when counting. He was puzzled: "When I went out, I was obviously driving five donkeys. How did I become four?" Did you lose one on the way? "So he struggled in my mind for a long time, four-headed and five-brained.

When he got to the market, he jumped off the donkey's back and counted the donkeys in a hurry. Not bad, just five. Only then did he understand: "I rode one on the road before!" " "

The story is selected from Jingdeyu written by the original Taoist in Song Dynasty (Volume 29, Zhigong and Monk Mahayana). The joke "riding a donkey to find a donkey" was later used as an idiom, meaning that things are in your own hands and you should look everywhere.