I wasn't wowed by this at all, especially for the price. Doesn't really seem to do anything for my skin personally. If I skip it I don't even notice. Was pleasant to use, absorbs fast, and light tea tree scent.
The ingredients are definitely nice but just didn't work for me. I don't see myself purchasing this again.
Edit: Added an additional star. After testing it more in my routine and upping my retinoid usage, I do notice that it calms and helps moisturise when I skip this product. That said, when I make sure to fill the opening with products that also calm and moisturise, I don't see a difference. For the original price Stylekorean has it for, I would skip unless it were on sale. However, I do see it listed on other sites for a much more reasonable price. In those cases I'd say this is a 5/5, but I'd expect more if this product were really over $40.