Since the magpie is called "happiness", there must be an incidental story. I searched and searched in ancient books. Finally, in Volume IV of Zhang Kun's Record of the Ruling and Opposition in the Tang Dynasty, I found such a legend: "Magpie noisy prison building", which is quite similar to "Night Cry": "In the last years of Zhenguan, Li Jingyi in the southern Tang Dynasty lived in an empty castle, and the people who lost cloth nearby later falsely accused Jingyi of stealing it, and he was locked in Nankang Prison for more than a month, so he illegally refused. If you want to hear it, its magpie is parked in the prison building and happy in Jingyi, which seems to be a message. There is forgiveness for its spread in Japan. The lawsuit came, just as I said when I saw Xuan. After three days of forgiveness, Jingyi returned to the mountain. The one who knows the mysterious clothes is also handed down by magpies. "

This is a very traditional story type that birds and animals repay kindness in China. Magpie is very grateful to people because it always eats the food fed by its neighbors. When its owner was in trouble, he not only personally went to the prison building to report the good news, but also became a human being, falsely preaching the imperial edict and helping the benefactor out of trouble. "Mysterious clothes and plain clothes" is the image of magpie's clothing.