This was the first COSRX product that I have tried. I was really impressed because most people say it doesn't do anything for them. My skin seems to be allergic to all moisturizers (I've tried over 10 which have all broken me out). This is a light essence that provides some moisture, but has a brightening effect on your skin. I am on my second bottle and I think I will always have to purchase it because it works so well for my skin!