This is a traditional way to test whether a woman is still a virgin. If her nose is hard, it means she is a virgin. If the nose is not as hard as before, it means that she is out of place. From the perspective of traditional Chinese medicine, the human body is symmetrical. So in Fall in Love with Hawthorn Tree, Jingqiu's mother is verifying whether Jingqiu is a virgin or not, that is, it is still not the original Jingqiu.