It was surgery from 2016, so I don't remember the cost, but I remember it being in the early 1 million won range after a student discount. I went without really knowing much about double-eyelid lines, but they did not explain in detail which line they would use for surgery (in-line, in-out line, etc.); they just pointed at my eyes and recommended one? So I entrusted it without being able to predict the result, and the surgery itself was kind and the outcome turned out well.
The double-eyelid line itself turned out well, and the scar does not show unless you look closely. Many people thought it was a natural double eyelid unless I said something. I lived satisfied with the surgery, but as of 2022 one side of the double eyelid had come loose, so I am thinking about revision surgery now (it does not seem to be from the surgery itself; I also rub my eyes often and have weak eyelid-opening strength, so it seems to have loosened little by little over the years).
However, I understand that a different doctor now performs the double-eyelid surgery, so I do not know how that doctor would be..