Or, alternatively, they realize it's impossible to run a country and not be corrupt. Then, all "presidents" are actually defacto dictators. Not too far off the reality of the matter...perhaps the US should get on this train.
Joking aside (I think I'm joking)... what else would "getting on that train" even look like?
I'm also not sure if what you said was an alternative to what I said. I said it may point out that South Koreas presidency is routinely corrupt, and you said "alternatively, what if they just realize all presidents are corrupt" -- that doesn't seem an alternative, those seem consistent!
moreover, the usa security apparatus designed south korea. they're a subsidiary country of the city of washington corporation (or something); i.e. they're on the same train already.
I must add that this is pure speculative guesswork, I ain't got no 'clearance'.