The one-eyed monster . What's the meaning of the one-eyed monster that Yang-rae is obsessed with to the point of drawing it on his wall?

Behold the One-Eyed Compromise Monster - the Olympics can't just be for the binocular any more. Or perhaps there's some aim here that hasn't been explained yet, ...

Whether the one-eyed monster represents Yang-rae's abusive step-father or Yang-rae himself, it's almost certain that this vision he talks of isn't actually a monster. Not in the fantastical sense.