Bone cutting procedures in South Korea are more prevalent than in the west in general. Only a small fraction of the jaw surgeries performed in Europe and the US are for purely aesthetic reason, where as having your jaws reset or sawed are routine in South Korea.
They've got many variation in osteotomies as apposed to only a limited few that they generally done in the west. They're also more on the adventurous side, Procedures like V-line osteotomy is pretty much the standard for many Korea women, but I have yet to see a European doctor who performs them. They are of course more affordable than western surgeons as well, and their jaw surgery approach is "surgery first", as in having the surgery first then the braces later, which cuts the overall orthodontic time frame by a margin.
This goes without saying that there does seem to be a whole lot of disaster cases over there, mainly for the very competitive nature of the plastic surgery market. I read on the purseforum that in many cases, they allow residents to perform your surgery after they knock you out.
The assembly line style they adopt is also unsettling, getting jaw surgery is a major operation and should not be taken lightly.