Story/Plot: This drama is about a mother trying to save her child and and a man trying to save his brother when they both get a second chance from fate. How this change will affect the people surrounding them forms the rest of the story. The plot is great for most of the drama with many twists and amazing cliffhangers but it falters in the last two episodes.
Acting/Cast: Cast of this drama is simply superb. This is one area where I have absolutely no complaints. Lee Bo Young and Cha Seung Woo are great and they also have great onscreen chemistry as partners which kinda explains lot of viewer enthusiasm for their pair-up to happen. Even the rest of the cast did their roles pretty well. Only thing is I felt Woo jin is a little bit wasted as he doesn't get much screen time.
Music: Thinking back I seriously dont remember anything about the music aspect of this drama which is a good thing and at the same time bad. The music is non-intrusive which is a good thing for thrillers. But at the same it doesn't have any memorable tracks (so a rating of 7)
Rewatch Value: This drama is definitely good for second viewing after watching the ending because you'll get a new perspective once you know the whole story. You'll start to understand the clues placed in earlier episodes as you watch them unlike in the 1st viewing where you have wait the writer to reveal them later.
Overall Impressions: As I was saying the plot for the most part is very very good with lots of twists and turns. But what I feel is this drama got really caught up in needing to add a twist ahead of us every step of the way, and that drive actually got in its own way of giving us a proper ending. You'll see so many twists ans so many revelations about the characters that by the end the main revelation fell flat for me. It was jus meh, just another revelation at that point which does not bode well for this drama. If the 1st 14 eps are rated 9~10 then the last 2 eps are only 7~8 IMO. Also the characters in this drama act quite intelligently (they also have eidetic memory to boot :P) for most part but sometimes they do really really stupid things without any logical reasoning just to move the plot in a certain direction. I can give you examples but I dont want to spoil anything. Although I'm rambling about negative points a lot this is still a very good drama (a bit too ambitious for its own good thats all). You should definitely watch this once and come to your own conclusion. My guarantee is you'll not be disappointed on the whole.

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