Lan Qi Gege already has a crush, Li Guangdi. When she ran to the Empress Dowager Xiao Zhuang in tears, the Empress Dowager said, You should put the interests of the Qing Dynasty first. In this way, Princess Lan Qi embarked on the road of intimacy. 10 years later, Grdan's power expanded rapidly. After such a long rest, Qing had the strength to attack Grdan.
There were countless casualties in the battle between the two armies, and Gerdan was defeated. She watched her favorite husband be killed by her brother Yin Gui, and all this was caused by her father. She can't stand the trauma in her heart any longer. In the end, instead of going back to Kangxi and Rong Fei to enjoy life with her parents, she chose to stay with her son and stay on the grassland forever.
In the extended information TV series, Lan is the daughter of Emperor Kangxi, a fictional character. None of Kangxi's daughters had a princess named Lan Qier. Qier Lan's position changed like this: at first it wasn't even Gege, but later it was called Lanqi Gege. When she married Gedan, she was awarded the title of Princess Heshuo. Of course, this is just the need of the plot.
In fact, since Lan Qi Gege's mother is a concubine, she should be a Heshuo princess from the moment she was born. Emperor Kangxi never married his daughter to Gerdan in history. Gedan's wife is not Lanzil at all. In addition, it is also fictitious that Gedan and Lanzil's son Ami reached the position of quasi-Gedan leader in TV series.
References:
Baidu Encyclopedia-Lan Qier