I may be too late for a review but this I want to say what I have to say. I badly want to watch it when it was on-going but I'm so busy in my study back then that I stop watching dramas.

This drama started of fun and is really intriguing. They open up the variables little by little and open up many loopholes for each character and feature new characters (plus the side stories) as the story progress that slows it until everything turns out devastating as you became aware of what tragedy might happen yet having a little hope that things will turn up differently. But it was indeed tragic that I ended up crying straight the last two episodes. I don't really expect a happy ending, like happy- happy ending since I don't expect much of that in genres like this but this is just too tragic and disappointing because things turn out just the way it really is, like you expect from the characters they build whilst the story process only to end up like all of those progress don't made sense. Another thing, a lot of loopholes still are left open that it just left you hanging

Acting was great! Lee Seung Gi and Cha Seung Won really pulled this one really hard. I'm getting curious why a lot don't like Oh Yeon Seo but I think she just build the character perfectly for it. The supporting characters are good, even though some of them needs improving. The romance line seems new to me but the tension between them is exciting and they don't fail to bring up the chemistry anyway.

OSTs are bomb it will end up playing in your mind. The cinematography, effects, etc. are good except for the CGI in the finale.

All in all this drama is really something that you can enjoy but don't expect much on the ending.