I did some research a while back and more or less decided that Korea is not a great place to get a Brazilian butt lift. More places are offering fat transfers these days, but implants are still more common, which I think speaks to the lack of confidence in the procedure. And the most famous buttock augmentation clinic specialises in using Sculptra. Plus, Korean butt aesthetics are not very close to what I'd consider my ideal. Half of the time, I was looking at the after-result photos thinking they were the before shots...
I also looked into Thailand. The level of confidence among surgeons seemed to be higher than in Korea; some were saying they had performed hundreds of BBLs. But most of the doctors I contacted were only willing to discuss the procedure in really broad terms without a consultation. (Which I understand, but I'm not going to fly to all the way Thailand for a consultation if I can't see patient results etc beforehand.)
I thought Dr. Yap in the Philippines has some really impressive BBL before/afters on his Instagram. But he also has some pretty scathing reviews on this forum, so I left it at that.
And there are some very positive reviews on RealSelf about Dr Gavin Chan in Melbourne (I live in Australia), but he's not a Board-certified plastic surgeon.
So, back to square one for me. If I lived in America, I'd most likely choose to do it there (or even Latin America), but there aren't many options in Australia unfortunately. I'd be interested in hearing about other people's experiences with the procedure too.