The Man Behind the Security Cam
He is Kim Ki-Duk, right?
He is, not only directing the movie from the outside, but from the inside as well... he decides wether they can see each other, kiss, have sex (he actually didn't intervine here, but he could have stopped them, or could have allowed them if the guard didn't let them do their thing)..
I didn't see anyone else that looked like him, so that person must be him..
besides.. it fits perfectly..
Just need confirmation to make sure I'm not crazy (?)