Idk if anyone else has mentioned it but man I hate how writers in stories like these will make characters so unbelievably evil that they're just dumb. Like why can't she tell him off for looking at her at school if it bothers her so much? Nobody cares about this guy, everyone shits on him openly, even your close friends, they would not care if you were mean to him at all, they'd even encourage it, so why can't you just be openly mean to him like literally everyone else including all your friends?
Why did you talk to him at all if you hated him? Literally no one in your class likes him, it's not going to win you any social points to try and be nice to him, so why do that and then get mad when he takes an interest in you for being the only person in his class that isn't 24/7 shitting on him? Like what did you think was going to happen?
And finally, your plan to resolve this isn't to just start openly being a bitch to him like everyone else which would probably make him stop, it's to try and fucking kill him, an act that if any part of it goes wrong and you're caught for would actually ruin your life so WHY WOULD YOU DO IT??? And the real reason why is just because it needed to be a big twist that there was this innocent looking girl that was secretly also an asshole, so she had to hide that she was an asshole for some reason, and do something particularly heinous when it's revealed.
Except everyone could see this shit coming from a fucking mile away so what was even the point of this? The worst part is she isn't gonna face serious realistic consequences for trying to murder a guy out of no where judging by what everyone is saying about the WN, this person who the MC knows is a murderous sociopath is just gonna keep going to school so they can be a source of petty conflict for the plot. This is so fucking stupid man I can't keep reading garbage like this lol.