In the end, Si Yixian decided to sue Chen Li, despite her young age, to teach her a lesson not to scheme against other people and not to covet others' possessions. He would have changed his mind and let her off the hook, but he didn't see any regrets or remorse on her face at all.
Alas, she only wanted to drag Su Xiaofei to her demise, pushing all the blame to her former young miss as if it was Su Xiaofei's fault that she had been stealing her things and impersonating her identity. It was clear that Chen Li wasn't planning to admit her mistakes and take responsibility for them.
Words were like water, once poured out, it could never be retrieved by the person who had uttered them. It was impossible for others not to see Chen Li's blackened heart.