In real life there really exist people like that, who likes to compare and indirectly downgrade others. Kangha is probably just too nice but if it was me I'd totally show off and slap that madafacka.
I mean I get that the kid is a little bratty (mostly because of how his mother raised him) but damn, you don't have to grab a little child like that...he's crazy indeed. When I first read the raw I almost choked myself seeing how crazy he was.
The second male lead syndrome is strong HALP