What is the relationship between Sunny and Zhen Xuan in Princess Pearl?

You may not find anything in Princess Pearl just by looking at the concubines in the palace, but it would be terrible if you put them together. Wei Zigege, who is obviously a granddaughter, has no sunny who is not a granddaughter, and is loved by Zhen Xuan. If you watch the play carefully, you will find the big secret of Qing Er Gege's life. On the surface, Sunny is the daughter of Hong Zhan, the son of Guo Ziyu County. Later, it is said that Guo Ziyu County was killed in battle, and then his wife was double suicide, leaving only Sunny herself. Therefore, Galeries Lafayette Zhen Xuan received Sunny in the palace. If you study Hong Zhan's life deeply, you will find another big surprise. In fact, Hong Zhan is the illegitimate child of King Zhen Xuan of Guo Jun. Later, Hong Zhan inherited the title of King of Guo Jun and was born on a sunny day, but King Guo Jun did not die. According to historical records, he should be suspected by Qianlong and died of depression. Sunny's life is clear, yes, yes, she is Zhen Xuan's granddaughter, because of the influence of the outside world, can only be said to be the daughter of the prince.