You've been talking nonsense,don't reinvent your own history.
Chung-eun has never invade the yumi's privacy.
In fact,it's the very opposite
She has always respected and always did what Yumi wanted.
The one and only time when she done something wrong,it's when she destroyed the board but she made more than cleaned up in sacrificing her status of G/T student,for save yumi.
And independently of their relation,yumi will never succeed in this domain (or any other one) if she suffers from inferiority complex.

Understand now..chungeun has a talent but she’s copying her mother style. Even i dont like hyeyeon but when she told to chungeun which is chungeun too obsessed with yumi r really on point, no doubt thats mental disorder..i hope chung and yumi will be ok