I honestly think the bullying thing isn't even the point, I don't think he's even in it for revenge. Or at least not anymore. The friend said it, he's just looking for reasons to be near him. He had a crush on him in high school. He talks about his "radiant smile back in high school" and we've seen already that the smell thing has stuck. He said recently that he shouldn't have let him get away back then, that he could've had him sooner. That he's everything he wants. We've also seen many thought bubbles from Jaemin throughout the story that make it clear he's crushing on him.
So it was true, I wasn't being delusional T^T
Dude deadass the crazy part is the ML ain’t even going after the guys who ACTUALLY bullied him, but to the person who turned a blind eye to it. It’s insane.