That's exact definition of Yoongun's behaviour: he toys with Kyuho's feelings. Strange he doesn't get it in the slightest, it doesn't even remotely cross his mind to question his conduct. The possibility other people might view the way he acts differently than he himself does simply doesn't exist in his universe: by this point I don't even know how to cope with such people in real life - a disaster needs to happen to shatter their pure arrogance down, nothing else could be of any help, I believe.