This is one of the best dramas I have ever watched! I can say a thousand positives things about it and I find hard to found any negative. Reasons to recommend this drama: - An amazing touching and unforgivable love story with perfect chemistry between the couple and true hot kisses that would makes your heart flutter like crazy. - The original and thrilling plot with endless twists and surprises that would make you wonder what is going to happen next (and hardly you would even guess it right). - Excitement, suspense and insatiable hunger for keep watching without stop. Highly addictive once you start. - There are 20 episodes and you don't have enough. After finished you still thinking "What happened?" "What was all this about?" "Did I really understand the whole thing?" ; and when you believe to have understood all, then you just start to feel confuse again. Definitely need to be rewatched to enjoy of this details you didn't know at the beginning were important. - Despite of many time-travel theme dramas out there this one from my opinion is the best. Weak points in the drama: - Perhaps for more experts in time-travel theories the plot might have some holes or inaccuracies but as a general viewer I didn't find huge mistakes as in other dramas with similar plots. - The music fitted well to create the adequate atmosphere according to the scenes filmed at the time. However a good original selection of romantic songs would have helped in the enhancement of the romance. At last, I would like to mention that I enjoyed very much of the acting setting and conclusion in this drama. Again and again, Lee Jin Wook and Jo Yoon Hee were brilliant together, you really wish their love would survive after all eventualities. I hope to see more great moments with Lee Jin Wook in the new drama "The Three Musketeers".