You'd probably find many of them near the place where the Americans are congregating. I live near a military base, and there are many foreign nationals from all over the world either meeting with their American counterparts or selling their products and services to the military.
Also, you may see an increase in foreign nationals (including Polish citizens) in South Korea in the coming years. The US has signed a free trade agreement with the South Koreans, so there's money to be made to those in international trade.
my femal cousin married last year a Korean guy from Seul. His parents and othe family came to Poland for wedding (they are catholics too), but they live now in Seul because of military service, that Justin (her husband) has to do yet.
His sister was in Poland too - ach... one of most beautyful women i ever seen in my life... :-)
But my femal cousin... i will try to find some contact with her and will give you information, ok?
have a nice time :-)))