I love this essence! I have very oily, acne prone, and congested skin, and I'm very concerned with treating post inflammatory hyperpigmentation. I found that even within one week of using this product that my skin became so radiant and soft. This essence contains great ingredients like niacinamide, which will help to brighten the skin (not whitening!), and sodium hyaluronate, a sodium salt variant of hyaluronic acid that is able to deeply penetrate into the skin, to help moisturize the skin. I began to see good results with my PIH at about I'd say a month after using it, since I also use other Korean skincare products to help w/it and at times I did not use it every single day nor twice a day as you're supposed to, and it was amazing to see years of PIH start to fade away. I use the Intensive version and I find that it is great. I think everybody should try this and see for yourself whether you like it or not. For people who are the same skin type as me with the same concerns, you definitely should try this.