E Yi Jijie Jintian Ye Zai Koushixinfei

A woman named Lin Anan is bound to a villain system and reincarnates as Hera, the cruel stepsister in a Western fantasy novel. The story follows Hera's role in tormenting the protagonist, Duoliya, though her actions are meant to secretly protect her. A system malfunction occurs when Hera touches Duoliya's bodily fluids, causing her to reveal her true emotions. Duoliya, who seems delicate, is actually a yandere who learns of Hera's secret and manipulates her with tears and saliva to expose her feelings. As their relationship becomes more complicated, Hera and Duoliya team up with the original antagonist to uncover a royal conspiracy and change their fates for the better.