I gave 8.5 because of the lead actors were so good acting and looks , wonderful pair.
The second couple also looks wonderful, but they have very little screen time, they even could have matched the main lead.
There was a jump in the story , where didn't show like how they fallen in love , but suddenly they starting feeling in deep love and ready to sacrifice, Most of the episodes are like that only, some time it feels like repeations, instead they should have focused on how they fallen in love . The story line and the cast was so amazing, it could have been one of the best korean melodrama .

what i enjoyed most in the drama is park boo young is really cute and so beautiful, and male lead also good looking and compatible to her., even the second lead couples are very good looking, and acting was great too.