I was introduced by a relative at Apgujeong (a branch in Ansan), and
my sister and friend also did it there. My sister
has been there for about 5 years and it is really well maintained, and
I also have epicanthoplasty because I like to pull out the eyelids from the front of my eyes haha. It looks like it has loosened, but my double eyelids are very good. Well, it's holding up really well.
My friend went a bit overboard and used the outline, but after 2 years, it loosened up a bit and her eyes went blank again.
But my sister and I used the in-out, and it worked well, and I think the slit is holding up pretty well.
The price was right at the time. I think it was 150 doubles + slit.