After the first half on the drama you will be able to understand the story, if you are able to pass that you will be completely into the drama. Why you should watch this? - GREAT CAST! Song Joong Ki is amazing, he's perfect for this role thanks to his angel baby face and his glacial stare. There is also Lee Kwang Soo! It was my first time to see Park Shi Yeon and Moon Chae Won and they were great too. - GREAT STORY! Tha plot it's the classic one of a revenge drama. You can find all the classics included amesia! - MUSIC! The OST it's not one of my favorite but it's ok for the story and it matches! - UNEXPECTED! You can't get bored by one episode and when you finish one you want to go on even if it's 4am and the day after you have to get up at 7am! It's really a good drama! And if what I've written it's no enough, well the view of Song Joonk Ki's arms worths all the episodes!