Loving the mc's character so far, she doesn't do a complete flip to her character (still a noble brat, just lowkey). This is the right kind of villain, instead of trying to be a better version of herself (in a good/innocent way) to help herself and others to avoid death/destruction she becomes a better person (in an evil way) in order to save herself and bring chaos to others.
If you're a person who dislike actual villain "villain" (a person who does actual bad things) then you'll find her actions uncomfortable. She's a bitch.
At first I wasn't excited about the romance part but wow, I love the ML and the two of them actually fit each other, no overly exaggerated blush, their interactions feels natural, I feel like a third wheel, a fangirl on the sides every time the ml appears.
Mc is a villain, and I'd be willing to be here underling. You'll understand when you get to know her.