yes, he's korean. i think he has a greco background, and he has a chin that rivals mark hunt's.
he had a bunch of fights in pride, and was undefeated until he fought real competition in kharitonov. is he really good at anything? i wouldn't say so, decent subs maybe, not good striking (though he just ko'ed gary goodridge), however both are good enough to beat people who don't really know what they're doing. his chin gives him a big advantage when people decide to slug it out with him, they will either punch themselves out (like soa palelei did) or they will get caught before he does.
he's a badass for his celebrations alone though.