Why did Ouyang Xueni lose her memory?

Animated stories need. Ouyang Sydney is one of the heroines in the domestic cartoon Cupid Go Down and its adaptation. She has red star eyes and a rather clumsy figure, which leads to amnesia due to the need of animation plot. "Cupid Chocolate" is adapted from "Cupid Chocolate in Progress" created by beautiful girl cartoonist Vivian, which is an online animation produced by Chongqing Shimei Animation.