I bought this because of my dull skin tone, and now I understand why it's called a must-have item.
I had been having many days where my face looked dull, so I was looking for a tone-correcting essence and tried Manyo Factory Galac Niacin 3.0 Essence. I had been curious about this product since I had seen it around a lot, and after using it myself, I found it to be quite comfortable for daily use. The texture is thin and light, so it absorbs quickly into the skin, and I liked that it left almost no stickiness after application.
I tried using it both morning and evening, and I found it convenient because it didn't pill even when applied before sunscreen in the morning. In the evening, I spread about two or three drops all over my face after toner, and applied an extra layer to my cheeks where dullness was a concern. It is difficult to say that my skin tone brightened dramatically in a short period, but I gradually started to feel like my skin was looking clearer, so I want to continue using it.
I think it would be easy to use for those looking for a light whitening essence or for those trying a niacinamide product for the first time.