The identity of Qin Keqing in A Dream of Red Mansions is indeed one of the biggest mysteries. Judging from the ostentation and extravagance of her death, it didn't match her identity at that time. However, it is far-fetched for our teacher Liu to say that she is the daughter of the abandoned prince Yin. As we know, the abandoned Prince Yin Yong has not only a daughter, but also a son. It may be because Yin Ren was abandoned early in the morning and was put in limbo, so he didn't take part in the competition for Jiuzi's office. His son was later knighted by Yongzheng.