Wang Di, the title of Du Yu, the king of Shu in ancient mythology. Because of the flood, he gave way to his courtiers, and he lived in seclusion in the mountains. After his death, he became a cuckoo, moaning day and night until his blood came out, and everyone who heard it felt sad and sad.
Extended data
This allusion was used in several later works.
Yuan Guan Hanqing's Dou Eyuan once quoted this allusion: "If there were no spiritual saints handed down from generation to generation, it would not be Zhan Qing. I don't want half a star's blood and red dust, all of which are just gun elements hanging on the eight-foot flag. When he looks around, he will see that this is our Hong Bihua and Wang Di Crow. "
Don? Li Shangyin's "Jinse": "Saint Zhuangzi daydreaming, bewitched by butterflies, cuckoo crows in spring."
It is often used to express one's grievances or unfulfilled ideals and ambitions.
Baidu Encyclopedia-Wang Di Crow