Help find bl

It's korean I don't remember a lot about the couple because the thing that I remember the most is the villain I think he was extremely violent and there's this guy he wanted to have relations with who is trying to have a career as model/actor/idol when he notices the villain is a bad person he calls his cousin and the villain actually kills the cousin by stabbing his neck.
This happens when villain is an adult I think the manhwa starts with mc ml and villain in high school, I might be misremembering it but I think there's a money gap between the couple