I don't know why they don't just video the bully bullying the students and abusing his father's power over the school. We know how important reputation and image is in south Korea.
If they make a plot twist where the mom isn't a psychotic murderer and it was the main character who did it all along I'll be freaking pissed. I mean you can't just make the mom not a psycho when you just showed us her literally burning the letter and eating the gift namsoo was gonna give to MC, like how did she get them if she wasn't the one that murdered her???