@Pandawanka
I haven't read the novel past the current manga so I have no idea, but I've heard great things about the upcoming chapters so we'll see how everything goes.
It seems like it's Sung Jin-Woo who is fated to rule the dungeon beings. We'll probably see eventually that he was granted his powers to unite the gates and either fight with whoever influences the monsters to kill humans or fight against them. Either way I predict an epic "race war" if that...
@VincentYamato
in the most recent arc where they did the competition, the tall guy and mage girl participated with them while the smaller guy stayed out so he hasnt been present for a while.