What is the fairy tale of riding an ass backwards?

The fairy tale of Zhang riding an ass upside down.

Allusion 1: According to legend, Zhang was an official in North Korea and saved a lot of money. Later, he felt that it was not easy to be an official, and he was afraid that he would be laughed at if he couldn't do it, so he resigned and returned to his hometown. Walking, I came to the edge of my hometown camp. I saw a girl in the distance, slim, picking cotton in the field. I chatted with others and flirted with that girl. I didn't know that the girl was my own daughter until she was taken away by the girl. I can't wait to get into the cracks and feel embarrassed to go home. I quickly turned around and went to the mountains to practice. Later, he turned over a new leaf and became an immortal. Zhang didn't go back to his hometown, but he always took this wrong thing to heart. He felt embarrassed to meet everyone, and since then, he has been riding a donkey with his back forward.