I'm a firm believer in the fact that if you expect too much you can easily be disappointed. So in this light, I write this review... Please finish reading so you don't get the wrong idea. The beginning of the first episode was a little sloppy and the characters were not at all endearing or interesting so I actually stopped watching this a long time ago then recently gave it another chance. I'm glad I did. Just push through... the story is worth it. As many others have written... The child and teen actors REALLY nailed it! The casting for the most important adult roles was quite disappointing with the exception of Kim Min-Seo and Yoon Seung-Ah. I also felt that the chemistry that was SO present in the teen characters was lacking in the adults. Try not to be too disappointed. I wish they could have just tried to age the teens as they were amazing. I feel that Yoon Seung-Ah would have been a better choice for the adult female lead and Lee Min Ho would have ROCKED as the adult male lead. Their looks are also closer to the teen leads. So all in all great story but because of the lack of careful casting I felt that this drama could have been better. This is the MAIN reason for the lower score. The soundtrack was also not as good as most dramas I have seen. Not HORRIBLE, just lacking passion. I would definitely consider it better than most, but SHOULD have been GREAT. Keeping my first sentence in mind ... hopefully you'll enjoy!