Li Changge's prototype is his daughter Li. After the change of Xuanwu Gate, Li Shimin killed his eldest brother Li and his fourth brother Li Yuanji, and also got rid of their son, which means exterminating the grass. After all, I can't bear to kill Li's daughter, one of whom is yongning princess Li Changge.

Li Changge, the heroine in the domestic cartoon "Long Song Xing" and its derivative works, is the illegitimate daughter of former Prince Li, and her mother is Uighur monarch Abu Gamasu (Li Jin). Long Song was named "yongning princess" by Li Yuande because he invited Turks and Qinqin as a child. Later, the kiss was stopped by Li Shimin, but the title of princess was retained.