If it keeps going the way I think it will go, Siwoo is the one with complete control and red will become his dog. I think this is a form of revenge for all the shit redhead put Suha and Jiwoo went through via his machinations. If he really does fall for redhead, it will be because he's tamed the vicious dog. Also, with Siwoo, it's also entirely possible that he will destroy redhead. A definite game is afoot, with Siwoo as gamemaster.
How can one man be so adorable?! The gap moe is strong in this one.