I'm sure you've heard this line before when a boyfriend dumps his girlfriend..."it's not you...it's me.  This drama had a great storyline, the cinematography excellent and it fits right up my "all I want in a drama" category.  But...in spite of all the positives that I gleaned from watching the first few episodes, I could not continue.  I know, it's not the drama....it's me.  I felt Park Bo Gum was miscast.  He's too young and his face, although handsome, was a little bit effeminate for the role.  Song Hye Kyo as Cha Soo Hyun portrayed a character so controlled and stoic so I thought that what she needed was a more passionate man that would awaken her from the placidness of her life.  The encounter or love story between Cha Soo Hyun and Kim Jin Hyuk lacked the intensity I expected and without that, the rest of the drama became a meh for me.  There was a total lack of chemistry and they looked more like an elder sister and younger brother.  I'm not concerned about the age gap because it does work if the characters have the right chemistry to make it work (to this day My Name is Kim Sam Soon is still my favourite K drama).  A So Ji Sub, Jo In Sung (think What Happened in Bali where both were fighting over the same woman)  or a Lee Dong Gun (Love Now) would have been perfect for the role.  They're not only gorgeous but they have the depth and ferocity to portray a man deeply in love with SHK's character.