Someone asked that before and imma just copy my reply haha:
I read that in one go so I’m not too sure as well, but that hyung (the guy who dragged chaon away and hit him) is some kind of long term employee of sehan‘s dad. He knows both Sehan and chaon since they were kids - and apparently, that hyung is the reason why chaon and his dad were even introduced into sehan‘s family.
That hyung has a wife and a daughter, but he’s weirdly obsessed with sehan. He used to adore him since sehan used to be so cute as a child.
He’s also the one who apparently locked chaon up, after he and sehan got into some kind of accident in that tunnel. Which is why chaon reacted to hysterically because he was scared that hyung would lock him up again.
Im sorry, but who's that guy with a scar on his cheek? I keep forgetting the characters bc my memories are too short