I started watching this drama when it first came out but even though I liked it from episode 1, I couldn't continue wstching it due to time issues. A few days ago, I decided to finish it and once I started, I couldn't stop watching episode after episode. As many of you probably know, the crew of this drama was the same staff that produced Queen In Hyun's Man, and it definitely shows. Not because the stories are similar (because they're not), but because they have the same quality. There are few to none plot holes and the every single detail is taken care of. So let's start digging a little deeper now. Story-the story is about a man who has a chance to change his life and fix all of his mistakes. This in itself is a wonderful theme because it gets us thinking about what would we change of our life if we could and what would be the consequences of that change. What I loved about this story is that it never was predictable, you never know what's going to happen next, and it manages to mix romance, action and character development in a completely natural way. I personally loved the ending, it was fitting to the rest of the drama. I really liked that even though Park Sun Woo kept going back to the past, he almost never changed anything for his own benefit, but for the benefit of others. Even when he makes a mistake that turns his life completely upside-down (and not for the best), he refuses to go back and fix it. Acting- I can honestly say that it was genius. Lee Jin Wook's portrayal of Park Sun Woo was right on spot, bringing us to tears one moment and making us choke laughing at the next moment. Jo Yoon Hee also did a great work with her character, being irresistibly adorable, completely straight forward with her love but at the same time managing to be innocent. I have to make an honorary mention at something she said because I literally rolled in the floor laughing because of it. At one point she says to PSW while throwing a tantrum "You're going to ruin my life by letting me die a virgin!!". And that brings me to the chemistry. The chemistry between the protagonists was sizzling,making the love story not only believable but relatable. Rhey made you root for them as they went through many obstacles together. The rest of the cast was also amazing, making us not only focus on the romance but also on friendship and family relationships. The only weak link on the cast was Jeong Dong Hwan, who over acted his role and made the EXACT same face EVERY single time he discovered something (OoO). Music-It wasn't bad but it wasn't anything special either. Rewatch- i will definitely watch this again soon, if only to get all the details and contrast of this complex story. This is a really good and neat drama that will never get you bored but keep you on the edge of your seat the whole time. If you like action or suspense dramas, or dramas that will get you thinking, this is definitely your cup, I highly recommend it.