I really liked this drama, I recently re-watched this drama this past year (2013) and I enjoyed it just about as much as I did when I watched it the first time. Obviously there is a switch of birth at the hospital by a nurse filled with revenge against the villain. Cast: I loved most of the characters, and hated a few too. My favorite was not the main lead (but he was the reason I watched this drama the first time lol) I fell in love with Park Hae Jin's character (this is actually the drama where I became a fan of Park Hae Jin) - he plays the good guys son raised by the villain - he has a lot of pain in his heart b/c he is good-natured but get's forced to do things at times that go against his conscience. He does what his "father" orders him to do and puts a seal on his heart in order to act it out. He will commit one MAJOR sin in this drama - but as the drama progresses you feel for him again and he wiggles his way into your heart. (I personally found him more attractive than the lead guy) and I liked his "love story" more than the lead guys too lol. Don't get me wrong though I still loved the lead guy ALOT and I loved his "love story" too (but his is more tragic - his pulls ALOT of tears out of your eyes *sniff *sniff) The villains son - to be honest I liked him a bit at the beginning and then really started to detest him somewhere in the middle (believe me you probably will too - if you get emotionally attached to characters as I do). Music: was AMAZING!!! I loved how the producers kind of gave each character their OWN song (if you read the lyrics you'll understand what I mean - reading the lyrics as you watch the drama is a true tear jerker) Re-watch Value: Is a definite (since I have already re-watched this drama :D )