I recommend The Return Dermatology Clinic in Bongmyeong-dong, Daejeon.

This is a place I visited recently, and it turns out they provide excellent medical care. It's also a place where they give thorough skin care advice, so I recommend it. There is both a female director and a male director. I met the male director, and as soon as he saw me, he told me to get a pack right away before leaving. I was a bit skeptical but still received the pack, and my skin's elasticity was incredible!