The big difference is that in your own country the laws protect you from abuse, breached contracts, lying, cheating, and stealing, whereas in Asia, most of it, you can find yourself subjected to whatever some school tries to pull. As for China and Korea, let them teach themselves ESL. There is no need to help countries that hate most or all of the west. Let China and all of the wisdom of their claimed 5,000 years of culture carry them through and let the Koreans keep eating dogs. If you want to see something funny, get all of the teachers in Asia to go back home and watch how fast Asia develops. In almost no time, they'll take one giant step backwards which is where places like China and Korea belong.