Xu Ying is the older sister of Xu Yuan, but is actually the biological daughter of the housekeeper Cai Shuqin and Xu Peisheng. She pretends to be gentle and kind but is vicious and manipulative. She harms Xu Yuan by making her drunk and later pushing her off a balcony. She plans to let Xu Yuan marry Lu Ling in her place while she goes abroad to study, intending to reclaim Lu Ling later. She cherishes her scientific research reputation.
