This is one of those dramas that has a lot of fans yet isn't necessarily popular, so I was really intrigued. I was actually ready to drop it after the first episode, but I'm glad I stuck to my '5 episodes before dropping' rule this time. The Episodes went from being boring to keeping me on the edge of my seat really fast. The combination of Time Travel and Mystery got me hooked, even though the characters and romance weren't as impressive to me. This drama definitely left me with mixed feelings, but no regrets after completing it. I'll start with the romance, which is really the heart of the story, but was my least favorite part. Although the romance was written well, I just never really connected with the main couple the way I usually do when sucked into a K-drama. Jo Yoon Hee is super perky, and Lee Jin Wook knows how to look aloof & hot, but the chemistry between the two of them was lacking in my opinion. Jo Yoon Hee's cuteness was not enough to carry her through emotional scenes, and Lee Jin Wook (although a stronger actor than his co-star) too often seemed emotionless, even with all that his character goes through in the story. I wanted to fall in love with the love story much more than I did. Towards the end I cared a little more, but that's due to the great writing, not their performances. In general, I think the acting in the entire show was ok, but not stellar. Some of the supporting cast had more personality than the main characters. Still, I can't say that anyone in the cast was really bad... well, except for Jeong Dong Hwan. The stupid faces he made as Choi Jin Cheol were so cartoonishly bad that it was starting to piss me off. He started to remind me of Macaulay Culkin in Home Alone. I think the true star of this drama is the story. Once I got through the set up episodes, the story was non stop surprise revelations & plot twists, which I love. This is the kind of story that will leave you sleepless, as you marathon it, just so you can see what happens next. The story doesn't lose steam towards the end like most dramas do either, which is impressive. It also had the kind of ending that made me want to immediately re-watch the whole story from the beginning, although there weren't any real 'stand out' moments that I wanted to necessarily watch again. I'd re-watch just to see if knowing the ending would change how I see the rest of the drama. If you're not a fan of open endings, consider this a warning. Still I loved the ending, which made me think, and I don't think was that ambiguous. I believe it was way better than if everything was spelled out clearly or tied up with a corny happily ever after bow. There also weren't any glaring loose ends, which considering how complicated the story gets, was enough closure for me. I had no idea, based on the premise, that this would be one of the best written, and surprisingly believable, time travel k-dramas that I've seen. (and there are A LOT of time travel K-dramas!) With a different cast my score would have been much higher, which is the only reason why Nine: Nine Times Time Travel didn't quite make an "9" overall score from me. My review may not be as high as everyone else's, but I understand why there are so many fans, and would definitely recommend it, because who needs sleep? lol!