'Nine' is one of the drama that has the strongest story plot, ever. The main theme is time travel, and it is told in the most fascinating and neat way. The plot is quite complicated (yup, you'll need a little bit thinking) yet satisfying. Love story is not the main menu here (I need some time to be engaged to the couple), but it's there as a side dish to the main topic here: a journey to find happy life. The message is loud and clear: playing God has its own consequences, and so does our hero gets his. Good news is, if you move forward and live your life every day to your best, you'll grow into a good and brave person. Just believe what you want to believe, and love the person you love anyway. Keep it simple is the best. I can relate to the messages, really. This drama keeps me guessing till the very last minute and I must say that I'm quite satisfied with the ending except one thing (but I cannot say it out loud b/c it's a spoiler LOL but it's related to older / younger version of our hero). Anyway, I'm a fan of Lee Jin-wook since 'I Need Romance 2012', so two thumbs up! All the casts are pretty decent, except the one who plays Choi Jin-cheol a.k.a The Bad Chairman. In later episodes I found his expression is more comical, makes me cannot take him seriously, although he's a seriously bad villain, duh (pun intended). And a special shout out for Park Hyung-sik, who plays as our young hero. I believe he has a great future as an idol-actor! The background music is not very special. But it doesn't get in the way either. As for re-watch value, I'd love to watch 'Nine' again, in order to get a better perspective from overall story, as I already get the basic understanding of the plot. Overall, I totally recommend this drama for anyone who love sci-fi dramas, with in-depth philosophical perspective and complicated twist. Well done, Nine!