You know for such a "big" gang group to not have any guns is quite... They even have cops on their side. Also, Gamin's martial arts alone is the equivalent of firearms, they really ought to figure that out by now.
My boy gave that motherfucker the whipping his father never could.
@masskillops It's probably because of the gun laws in countries like Korea that makes it hard to procure one even for law enforcement, and/or the author simply not wanting guns in the picture since it might take away from the martial arts of the story.
I love that an underlying thread of the story is that a lot of the kids stuck in this teen gangster school just want to be normal students and have a chance at a decent future.