Chemical exfoliant is a rare breed in Korean skincare, but this BHA is great not only because it doesn't have many competitors, but because it really delivers what it promises: cleaner pores, smoother texture, overall brighter complexion. It even exfoliate the annoying dry patches which have been on the bottom of my feet for years. If the 80-20 rule applies to skincare, then Cosrx BHA is definitely the one you need to invest in.