these seem extreme cases they look kind of deformed in the before pics
I think a few of these are from a television program that gave plastic surgery to people with deformities. Besides that though, South Korea is the country with the highest amount of plastic surgery and from what I read, it's almost a given in major cities, like applying makeup.
Plastic surgery is so accepted in Korea(more specifically Seoul). You see ads for it everywhere, there are plastic surgery clinics in practically every high-rise, side street, and you see people who have gotten something done almost daily etc... Image is a HUGE deal and you have to fit the whole collectivist nature of the society.