...and more will come, unfortunately.
They are a huge mistake on aviation matters: lack of a reasonable, fair and consistent evaluation system; a quasi military approach to hierarchy and cockpit decision making process, absolutely away from modern CRM, like the fellow above mentioned. The more they got crazy about doing things right, the more they became lost.
Congratulations to FAA, that timely dowgraded them. The better decision would be simply banning them from USA.
Air Traffic Control contributes a lot on this outstandingly dangerous situation: there is a mix of military and civilian traffic from two megairports surrounded by 5 active Air Force Bases, doing flight trainning almost every day, fighters maneuvering at visual range of airliners, at high speeds! All in a specific frequency, different from that of general use, obviously.
Maybe Koreans think that to have money is enough: it would buy the finest machines, build nice airports and even buy expertise and experience.
Their arrogance will kill much more people.