I got a width-expansion procedure for the corners of my mouth from Director Shim Da-hyun, and I was satisfied with it. It does wear off over time, but it did not come off in a lumpy way. The price was the same as lip filler plus lip Botox! It felt like they only did exactly what was needed, without any overtreatment. I was sorry when they said the remaining solution would be discarded, but I think it was good that they only put in the right amount..!
It has been a year now, and almost all of it has worn off, but it does not feel like my mouth corners have gone back to being as round as before. I still feel like some horizontal widening remains! I hesitated because it was expensive, but I think I made the right choice getting it here.