Since there are no reviews on philtrum concavity other than philtrum contraction, I tried it myself ㅡㅡ I will only tell you the results. The side effects such as abnormal sensations are all over the place. It is a smaller surgery than expected. There is no swelling, so there is only a slight unnatural pronunciation when speaking. The effect is obtained by gently pressing the philtrum for about a month. That's it... It's just an optical illusion that no one knows and makes the philtrum look shorter by about 0.5 millimeters? That's it. The cost is 1.65 million won. It's a bit less cost-effective, but I don't regret it.