I got this after seeing Hanbyul on youtube mention how this helped her acne. I haven’t used it enough to say if this is true or not but I do find it calming to the skin. It’s a very very thin serum, very watery, more like a toner than a serum. Hence, I use it first in the essence stage, before a serum. Being so thin makes it sink into the skin very quickly and means you can layer other products without making your face feel heavy or clogged. Because it is so thin and makes it very easy to spread on your face (I usually spread it in my hands and then pat it in) that means there’s so much product andis really value for money.