Who is the jade emperor's fourth princess?

The four princesses of the Jade Emperor are called Qing Zi.

Qing Zi is the fourth princess in heaven. She is very clever and often uses her wisdom to help her sisters on the earth. I met Yu Ri, because I sent my seventh sister, Zil, to earth. After returning to heaven, I finally returned to earth, because I was infatuated with Yu Ri.

On that day, Yu Ri could not bear to be separated from Honger, the god of food. He drank the water given by the Queen Mother, lost part of his memory and came to a Taoist temple to become a monk. However, the Taoist temple has been occupied by Jia Sizhen, a hoodoo. Lao shifu wanted to accept Yu Ri as the next master, so he was nicknamed "Three Forgets". Yu Ri was persecuted by Jia Sizhen, and his life was saved by Iver. Qing Zi returned to dongjiacun on Hairtail Day, and finally recalled the memory of Yu Ri, and they hit it off.