To be honest, I am surprised at how much I enjoyed this series. It did take me over a year to finish (just took a break from watching kdramas at all) but I'm really glad I continued watching. Though the story isn't something very grand or complicated, it's really enjoyable to watch. It contains some serious themes surrounding appearance, (self-)love, friendship, etc. without diving too deep into them, which makes it very light-hearted overall. Before this I had just finished watching World of the Married which often left me feeling very upset regarding the heavy topics it discusses, so if you're looking for something that does the opposite I really recommend watching My ID is Gangnam Beauty.
The acting is good, nothing really outstanding but the actors are capable of making everything seem very believable. However, I kept in mind that this story is based on a webtoon so this results in the story and characters seeming a bit unrealistic/cartoonish at times (especially their obsession with looks and their ridiculous reactions where you'll just laugh at how silly it is).
I however LOVE LOVE the OST. It's so dreamy and it's one of those osts that doesn't make you feel annoyed any time it repeats.
I also consider this drama having quite a good rewatch value. Though the story is calmly paced, I can imagine putting this on on a rainy day and watching it with my bf.