At first glance, Ryu seems to be the typical 'bad boy'. He is, to an extent, but that's not all he is. Ryu works as a waiter in a resturant, but is also a writer. He publishes under the name 'Kage Ukita', and many of his books are quite successful, though he has made it a rule that he never does face-to-face interviews. Simply because he hates cameras. With a passion. He also insists that he does the artwork for his books himself as well, as he doesn't trust other people to have anything to do with his books. He's fussy like that. But he's successful enough to be allowed to be so fussy, and his publisher doesn't care as long as he gets the work done.
Outside of working, he isn't the easiest person to get along with...
He can be kind, but doesn't show it a lot, and if he does something nice for someone, he will hide it. Like instead of giving someone a present, he will leave it for them where he knows they'll find it, without a note or anything. So he's being nice, but not admitting it. And he will act as if he doesn't know anything, or that it's no big deal, if anyone asks, and continue being cold and distant to them. At least to their face.
If he finds someone he cares about though, he is a very open and caring person, though sometimes overprotective. He tends to get embarassed easily around that person, and tends to avoid eye contact. That's how you know he likes you.
Extra: there's a reason he uses a pen name. Trouble is, according to the media, 'Kage Ukita' has been writing books for almost 15 years...and Ryu's only 19. They can't possibly be the same person...can they?