There were several reasons why Xia Xibei chose to do this.
With Qiao Weiyue's status, even if the police were called, it wouldn't necessarily teach him anything.
After all, it was only attempted rape!
When the time came, he'd get a bunch of lawyers and naturally wash his hands of it all.
However, this was not good for Mu Qiaona.
In this strict society, women were already subject to much harsher accusations and discrimination.
Even if she was the victim, in the eyes of those who were watching, it was her fault.
When the time came, it would be her who would be hurt.
After that, if Mu Qiaona wanted to be a star, these things would hurt her a lot. After all, she hadn't grown up enough to be fearless of the elements.
Moreover, Qiao Weiyue was from the Qiao family and was Qiao Yanjue's older brother.
Even though they were not on good terms, this kind of thing would affect the Qiao family.