I honestly thought I did a review on this one.. First of all I have seen all the versions of this drama that has been made, but this is the one that I will watch over and over again.  The cast is TOTALLY AWESOME.   The chemistry was there from beginning to end was just fantastic.   I never got bored watching any of the episodes.  I had what most would call second lead syndrome.  I totally love Lee Hye YoungKang Hee Soo [Joon Pyo's mother]  is was awesome playing the villain in the drama.   There is nothing not to like about it.  I do have one tiny little complaint..I wish it was longer or had a second season to wrap things up.  

The music was beautifully done. My favorite is Because I am Stupid song by SS501.
https://www.youtube.com/watch?v=KdgAW2NzvxM

over all 10 out of 10
Put it on your to watch list..