I got double eyelid surgery + inner corner canthoplasty at a small dermatology/plastic surgery clinic in Guri, Gyeonggi-do.
I had it done around December 2014, so it has been about 7 years now. Among people who had it done around the same time, mine turned out the most natural and well done, and even now nobody knows I had double eyelid surgery, so I am very satisfied.
I remember where the clinic is, but I forgot the name.. (I went there on a friend's recommendation) I don't know the name of the director who performed the surgery either.