I had never seen the Japanese version or read the manga (Kimi Wa Petto) but now that I have there will be a few comparisons (you have been warned!) The storyline is okay, compared to the jdrama and manga it is kind of weak and (I noticed my first time watching it) somewhat rushed. I didn't feel like I had missed the main story, but some of the finer details that would have made everything a little more realistic - as realistic as a story like this could be.This would have been great as a drama! I think it needed more development but the emphasis of music was fun (except that final song. I hated that.) And it vaguely followed the manga but not really. Jang Geun Suk was adorable in this film, he acted the part of MoMo really well and I honestly thought he was perfect until I encountered the original. I don't think they could have picked a better Korean actor for the part. The rest of the cast seemed to fade into the background for me and it wasn't bad, but it wasn't the best. Kim Ha Neul was okay; some people complain she is creepy and even the whole idea behind the film is horrible, but I think she emphasized the role of a woman joking and proposing an outlandish idea to get rid of kid and then getting in too deep pretty well. However, I just didn't feel that much chemistry between her and Jang Geun Suk. If you haven't seen the jdrama version or read the manga you will probably like this. The story is quirky, cute and funny. I loved it until I encountered the originals. I might rewatch this, especially if I want something super cute in a very short amount of time and I think everyone should try it BUT the Japanese version is better in my opinion. That being said, I cannot wait to try out the remake of the Jdrama with 16 episodes.