Short: This one is light and fluffy, some decent humour and an overall nice message for people. It's not really about being pretty at all, this one is about self confidence. Fantastic chemistry between the leads, and other awesome characters too! Light bouncy music just completes the "fun" feeling of this one.

Detailed:
Last time I saw a drama with Hwang Jung Eum was Kill Me, Heal Me - and honestly I wasn't the greatest fan of the over the top shrieking so I went into this one looking to see more from this actor and how she is in other roles. Have to say, thoroughly enjoyed her work in this one, rather than the shrieks in the car of the other drama, this one has much more comically timed reactions and she plays the comedic role well. The counter play between her and Choi Shi Won's character is brilliantly written and brilliantly portrayed and they provide a really nice mischievous comedy element. The comedy tends towards the usual type i've seen in K-drama, a bit over the top, but there were numerous laugh-out-loud moments and most of them were this pair.

The premise of the drama is that as a young girl she was beautiful and was best friends with the boy who lived next door, an overweight lad with some issues, they bond supporting each other and have a great friendship until his family moves away. Many years later, there is the opportunity to re-unite, but as she no longer feels she is the same pretty person she was, she asks her best friend to stand in for her. It's just a recipe for things to go wrong really!

There's a couple in her workplace who I found really entertaining to watch, I'm a fan of Shin Hye Sun's work anyway so I always enjoy seeing her on screen but really found her character development to be fun to watch.

Overall, this one is quite light hearted, some really funny moments, but also some loud ones so if you're watching this one late at night on the main TV be prepared to be as shocked as the FL is and ready to turn the TV volume down :)

It's also one of those dramas that has the really nice long ending so you get to enjoy some of the happiness that was worked for so hard during the main part of the story. Very nicely done.

There's a really nice overall message about self confidence in this drama, the title and description presents it as being potentially superficial - but, hey, you should know better by now, that's not how these things work, there's a lot more to it :)

Great fun, been hooked watching it from start to finish!

Highly re-watchable too, there are some clever reveals and secret identities but honestly I can't see it being any less interesting even if you know the answers to those questions.