I'm currently in Seoul, but I had double jaw surgery in my early 20s at a dental clinic in Daegu.
There was excessive bleeding during the surgery, but thanks to good collaboration with a nearby university hospital, the surgery was completed safely.
People around me say that my face has become much smaller, but I wish it was a little slimmer.
After the surgery, I heard that the doctor cut it appropriately because it seemed like there might be side effects if it was made slimmer.
Of course, there are many hospitals in Seoul that are good at double jaw surgery, but if you are planning to do it in Daegu, I recommend this hospital.
I believe that you will be able to undergo double jaw surgery safely and successfully.