Dropped because for one: her father is utterly unreasonable because he's literally sending a defenseless, magicless, pampered noble girl to a school which he knows probably has prejudicial biases against those with no magic. He should have given her some cash and told MC to make money.
Two: MC's mom is literally dead weight for everything. It surprises me that with her incompetence, she isn't locked up in some cold corner villa yet. To be perfectly frank, Selestia's just plain annoying. She doesn't have any ambition, can't read the room, and as a Matron of the House, she can't even manage internal affairs. It's no wonder the father relied on the second wife too much and favored her more: First Wife is literally just a pretty face and nothing else. There has to be a limit to how innocent you can be unless you're a three-year-old baby.
Three, because the MC's IQ suddenly dropped these few recent chapters. She knows that no one in that fucking school likes her. Why bother? Just escape away and build a trading empire as a merchant with all your past life's knowledge in finance. Sure, common sense might be a bit different, but with people, she could learn the ropes. For a past 'Cold and Overbearing Finance Genius who Manipulates and Assesses Everything and Everyone' MC's sure as far as it gets. If no one likes you or admits to your presence in that school, then leave! It's probably not the only magic school in the country or something. Besides, they're still commoners in the end, and MC's still an aristocrat. This means that no matter how much they ruin MC inside the school, she can still beat them back outside it. She's an aristocrat, and she should use that privilege to her advantage.
Four: The author's literally just shoving the ML down your throat as a lead. That's it. It's so out of the wall that it leaves you questioning where did that come from? That ties into the terrible writing and the forced romance/redemption arc. I mean??? Yeah, MC's an asshole. That's what has gotten them into a safe drive their entire time. Why are you trying to change that immediately? They need to be an asshole in this school full of assholes to get her own. Give MC a redemption arc with the proper TPO.
This had potential and it just decided to chuck that potential out of a ravine, unfortunately. The artist for this manwha is wasted on Im Dal-Young.