Korean Cosmetics... A lot better?

Nowadays, almost all of the girls use cosmetics so that they can satisfy their confidence to look good and better. In my personal life, I use cosmetic a lot because I think of my skin as not good enough. Cosmetics actually conceal my scars on my face because I don't have a clear complexion. With these cosmetics, I gained confidence to talk and meet new people as well as to call myself beautiful at times. But suddenly, korean cosmetics had caught my attention. Suddenly, etude house, tony moly, skin food, especially the BB cream has a lot of good feedback from different country. I wonder why their cosmetics seems to be an expensive one? Have you tired one of it? In their commercials or video / posters, the products of korean cosmetics really look good. What can you say about it?