Yi Guipin's son was not the Crown Prince. The Crown Prince was the son of the Empress.
Yes, Yi Guipin's son was the Third Prince, Li Chengping.
Yi Guipin was the Qing Emperor's concubine. She was the birth mother of the Third Prince, Li Chengping. Yi Guipin had deep feelings for the Third Prince and played an important role in the drama. She supported Fan Xian and had the Third Prince take Fan Xian as his master, hoping to help him grow. During the Jingdou rebellion, Yi Guipin had always stood by Fan Xian's side. She had become the winner of the Palace and was in charge of the rear palace. The role of Yi Guipin was played by Deng Tongtian and Sui Junbo respectively.
Qing Yu Nian Yi Gui Pin's son was called Li Chengping.
In " Celebrating Years 2," there was no plot of Yi Guipin beating up the Third Prince.
The son of Yi Guipin in the year of Qing was called Li Chengping.
The son of Yi Guipin in the year of Qing was called Li Chengping.
The son of Yi Guipin in the year of Qing was called Li Chengping.
Qing Yu Nian Yi Gui Pin's son was called Li Chengping.
In "Celebrating Years 2," Yi Guipin was the biological mother of the Third Prince. In the movie, there was a scene where she hit the Third Prince. She used a cane to hit the Third Prince fiercely, and even broke the cane. This scene showed Yi Guipin's conflicting emotions of being strict as a mother and loving her son.