So you are from Europe - I guess that Prof Remarcle seems to be a better adress then. But honestly - I do not really see the benefit of doing it in Germany. Wherever in Europe you are, probably you will have some hours of train ride or take a flight there anyways, the flight to Korea is a bit longer and more expensive but if that is all the difference, it does not deter me. Berlin is a 1 hour flight or so from here, but I gladly take the longer flight to Seoul from what I have gotten in terms of information up to now. And things going wrong - well in Korea you will be for 2 weeks anyways in case something goes wrong, and then upon return you can go to one of the surgeons or phoniaters who are familiar with glottoplasty in Europe and do your checkups.
It is rather hard to find patients who had voice surgery in Germany and most of them had CTA. It is a bit of a Taboo and scary topic
By the way - I am trending towards doing this surgery, but even though I could get it in Germany on insurance costs for no additional money, I will rather save money and pay Dr Kim because I just am really not convinced of the consistency of good results in Germany

- They can have good results but there are more people with raspy voices coming out of it than I am comfy with and I have not yet hear that of anyone from Dr Kim - the worst case with Dr Kim seems to be that the voice is a bit less loud and there was not enough increase in pitch (but at the same time the risk of falling down low is gone in any case)