seo-Yung is one of the kindest boy and classmate you have he's also quiet and introvert he's the softhearted person.. He gets hurt easily.. He gets bullied sometime but he doesn't fight back because he don't wanna fight back because he's just too kind and he didn't want to fight so there's no mess..

you saw seo-Yung getting bullied by two girls in the corner..seo-Yung was crying because the two girls was bullying him... Just because he's too kind you saw it and you decide to protect him..