It's not easy, having the invention of everything credited to your country. Korea would know.
For instance, he is ashamed to have invented pedophilia and rape. He tells himself that when he invents time travel, he will go back in time and stop his citizens from ever inventing those things.
He also doesn't like having invented Christianity and God, because his sister North Korea doesn't like those things and whenever they meet (it's very, very uncommon now) she rants about the horrible things he's invented, Christianity and God included. Escaping to Thailand through China and seeking asylum with him is also included.
However, Korea is sure that soon he will invent a way to convert his sister to democracy (he's very proud of inventing democracy) so she can be happier and hate less of the things he's invented.
Yes, it's not easy inventing everything, but Korea thinks that inventing lacrosse, hockey, basketball, insulin, zippers, and a myriad of other good things more than make up for inventing all of the bad.
Good triumphing over evil- he's also proud of inventing that.