I like the premise of this drama. To think that every choice a person makes will determine a different future is fun to think about. One of the points that the writer was trying to make is that you should try to make choices that won't lead to regret. I find the idea of time travel and parallel universes to be intriguing. Also, the thought that we all walk down our own paths and have to be happy inside ourselves before we can be happy with someone else is a theme in this drama. I think that is what makes good character development. I like the ending also...what is Mirae's choice??? It could be anything in any lifetime...good, bad, and ugly. I really like that idea. This drama had a couple of draw backs. First, it isn't a romantic comedy. I don't know why it is in that genre. Second, it is S-L-O-W. The same story could have been told in much fewer episodes. Lee Dong Gun, Jung Yong Hwa, Yoon Eun Hye and Han Chae Ah did a great job with their characters. I know that some people have problems with a few of these actors, but I think they all did an excellent job. The music is annoying. I won't rewatch this. I think that if you like dramas that make you think, then this is a good one for it. Especially if you like the thought of time travel and parallel universes.