
I just dont get how he doesn't know, ML is continued going to school even after MC ran away so logically he would've heard about what happened through the grapevine. Even MC friend knew what happened,.so the incident couldn't have been such a widely guarded secret . I feel it's author oversight to further the "estranged for a decade due to misunderstanding" plot line

He didn't know, when Jaewon started to bully Uke, he was abroad for like 3 months and when he came back Uke was gone. If he knew he wouldn't have asked Uke "why did you disappear suddenly 10 years ago" Even in this chapter you can see that Uke made it clear that Seo-in wasn't involved and still doesn't know what happened to him

It wouldn’t make sense for his character if he knew. He hated jaewon so much and cared/loved yeongwoon. He would’ve retaliated against jaewon had he known. Don’t forget that the mother went out of her way to silence everyone with money. And yeongwoon isn’t willing to tell seoin what happened either.
Do you guys think Seoin even knows about the bullying incident? Bc if it happens to get released then Yeongwoon will probably have no choice to tell him the truth— after all Seoin knows him well enough to figure out that that incident might have something to do with him