First of all, the papaya in the palace suggests the origin of Qin Keqing.
In A Dream of Red Mansions, the birth of Qin Keqing is clearly explained. He is an abandoned baby adopted by Qin Ye from Yang Sheng. However, as a staff member of the Ministry of Industry, it is impossible for Qin Ye to marry Jia Fu, the only grandson of Ningguo House, to marry an abandoned baby of unknown origin adopted from Yang Sheng as a housewife, so the birth of Qin Keqing in A Dream of Red Mansions is not credible. According to A Dream of Red Mansions? Is it true when it's fake? That Qin Keqing's life should be kept secret.
But the layout of Qin Keqing's rooms is basically related to the court figures in history. Jia Fu didn't spend so much money, and Mrs Jia didn't have so many luxurious decorations. How can abandoned babies in Qin Keqing have such luxury goods? The only explanation is that the author is metaphorically saying that Qin Keqing was born in a palace.
Secondly, Yang Guifei's Papaya implies the nondescript relationship between Qin Keqing and her father-in-law, Jia Zhen.
Qin Keqing Yin Funeral Tianxiang Building? Although it was deleted by Tso Gong, there is a papaya of Yang Guifei in Qin Keqing's room, and the love between Yang Guifei and Li Longji is well known. But Yang Guifei is the lifelong princess of Shouwang, the son of Li Longji, and Li Longji finally got Yang Yuhuan through a series of means because she coveted the beauty of her daughter-in-law Yang Yuhuan.
A drunken scolding from Jiao Da, an old slave of Ningguo Mansion, completely uncovered the fig leaf of Jia Zhen's "climbing the ashes". Jia Zhen, a lawless man, dared to turn Ningguo Mansion upside down, coveting the beauty of his daughter-in-law just like Tang Xuanzong, so he also got his daughter-in-law Qin Keqing by despicable means, and had a relationship with his daughter-in-law Qin Keqing, which finally led to Qin Keqing hanging himself.