This story isn't new and I have seen it done better. First of all, for a drama that is only four episodes long, I really was tired of rewatching the same scenes over and over. The premise is good, but the actual show is kind of boring. If you like this type of drama, then I recommend Nine: Nine Times Time Travel. It was much better. The young Moon Ga Young is totally adorable as Mimi. Chang Min does well as the really cute and tormented Min Woo. No amount of good acting could make this short drama good though. The music is pretty good. I won't rewatch this, but I think it is rewatchable considering it is only 4 episodes. It is only 4 hours of your time and you may like it more than me. However, I don't necessarily recommend it.