
This one is more of a slow burn but it's about a bully who grows up into a successful higher up employee with a wife and daughter. His daughter is a high school student and her teacher is the grown up kid he bullied. The daughter begins to get bullied and we find out how shitty the dad still is throughout. Disclaimer the teacher does not get romantically involved with any student nor does he murder any student. It's more of him collecting evidence to get this man and the bullies known for their injustices. Fair warning only near the end is everything revealed.
https://www.mangago.zone/read-manga/ijimeru_aitsu_ga_waruinoka_ijimerareta_boku_ga_waruinoka/
Recommend something like this please, I'm done with psycho BL and the anti hero cop.