Well I just finished this series and can't stop myself not to write a review! At first I watched it just because I saw that the main character'role is being played by Song joong ki (yeah...I'm a big fan of him) and about the series.... Ahhhh I'm still confused and I don't know about my feelings but about The story... The story of drama was really great....for me it was something special. It had so Many points and parallels, I liked the story really much ! Each down and high of the story was perfect the Idea of that was really wise and the author seems to be a genius one in writing melodrama!....about the acting, it was definitely great! Specially Song Joong Ki's play was literally masterpiece!! Moon chae won and Park she yeon were great too! the only person that I didn't like her acting was the one who played for MaRoo's sister, I couldn't understand her play and I mean I wasn't satisfied with her act! But others did their best and I loved them!!! ..... About The ending...well people usually ask about the ending if it's happy or sad but the fact is that it's neither sad nor happy!! It just drowns you in an ocean of emotions and confusion! It can be kinda open ended about what you think has happend to Ma Roo after his operation but I reassure you that Maroo and Eun gi become a couple (and of course wife and husband in the future!)....but this ending is not what I can consider it as something happy! Since before the ending a pile of problems and circumstances happens and immediately you get to underestand them and see the consequences and all of them lead you to experience tension and finally, in the end, when you want to see the ending's happiness, when you think everything is over and now you will get to see the good scenes that you have prepared yourself for it, suddenly it skips the time and shows you some years later with an unexpected atmosphere! And after finishing remains you shocked and you say"omg what was this?" "What just happend?"! And you know, The ending doesn't hurt you, but maybe doesn't satisfy you!(actually I myself wasn't satisfy with that) I mean probably the author wanted to give it a different ending from other dramas but in my opinion the author wasn't successful about this point! But altogether I can say that at least they didn't give us a bad or sad ending! Yeah! And I believe it surely values watching once bc it gives you sth completely distinguished from other dramas and makes you to think and try to feel so many feelings but about rewatching...well it actually depends on the person! I myself probably never can rewatch it again bc im not those kinds of persons who  used to watch such melodramas, but watching at least once is essential! ..... I said all of the good points about the drama but just one issue about the drama was really weak in my opinion, and it was the Characterizations of persons! Ma Roo was a kind, smart and a complete devoted person for his love, a true lover! But no one could understand it, no one could value him, no one could behave fairly towards him and it really bothered me:( and again I wanna say that SJK was a perfect actor during the series!!! I just can't believe how much an actor can be such amazing! And about characters: Han Jae hee: didn't like her at all, from the very beginning showed her betrayal until the very end! And about So Eun Gi: I liked her in the first episodes but after ep8 and specially after her memories back, she wasn't understandable and I didn't like her anymore ... MaRoo did what ever he could for her , while he was in the worst condition, helped Eun gi to become treated but she seeked for the revenge! What a poison is this?? Yeah I just had problem with the characterizations of some characters but in the end, I wanna say, if you want to watch sth different, see the power of hatred and love , see the effects of revenge and excessive sacrifice, give it a try!