I kinda hope the her brother just dies or ends up miserable, so far he is such a f*cker

But you can't deny that he just have bipolar disorder... I mean, he's the way he is because of the emperor.

Her sister was never cruel to him, done nothing to receive his hatred, yet first he treats her like a puppet with not an ounce of affection and then starts to like her yet still wants to lock her up.
He is sick alright but still it doesn't make him any less hateful. Every possessive jerk brooding male lead has a sad back story yet I refuse any downplay for their sh*tty behavior.