Korea was under Japanese colonial rule from 1910 until the end of the war, millions of people were forced into labour and men were drafted and sent on the battlefield (I won't even talk about what women were made to do). Hundred of thousands of Koreans were taken to Japan and now you are surprised that they are still there? And that they have the right to live there? Aren't you hypocritical? This is what happens when you occupy other people's countries.