I've been using this for about two weeks now and I can see the change in my skin. I have combination skin, and an uneven skin tone. After trying this just once I could see a slight difference the next morning, not to mention how soft it leaves your skin feeling once its absorbed. The serum itself is odd, its clear and goes on easy but it does feel sticky for about a minute or two, once it has absorbed you don't feel it at all which is great. Like other reviewers have said, use just one pump and it'll work beautifully. I would whole heartedly recommend this product as what it is, a brightening serum. It's not a moisturizer so don't expect some intense hydration. I would definitely consider this holy grail worthy tho, I've tried so many western and korean brightening products and for the price this is absolutely amazing. Only thing I do want to say, the bottle was much smaller than I expected; I was thinking it'd be like the size of the average body spray but its a bit smaller. Nonetheless, great for the price. 

I think this product is great, my skin looks more clean and firm but I have a dry skin and the hydratation isn't enough for me. 

Been using the product for a couple of months now, I don't really notice a big difference. I pair this with the COSRX Galactomyces Alcohol Free Toner. The essence is a lot more watery than other essences I tried and it doesn't seem like my skin abosrb this product well. This product also gives your face a slight shine to the forehead after application and halfway through the day, my forehead will be a lot more oily than usual. I have normal skin.

I first tried this product thanks to a sample, and I loved it. 

But once I bought the bottle, I didn't notice any real change...

It's not bad, but it's not Holy Grail material either...

Brighten up your skin after a period of time!