I'll start off my review by saying Ji Sung deserves best male actor of 2015 because his acting was so powerful that it was no longer just a show for me, but that somewhere far away someone was actually going through this. You could see how versatile his acting skills was because he brilliantly pulled off all his personalities. He did such a fabulous job because I was able to form a connection with him as an audience, BTW Ah Yo na was my favorite personality! This drama was something I had never watched before because of its portray of the DID sickness which was both brilliantly and creatively done. Yes, the family drama and the traumatic childhood was not so different from other korean plots, but the way everything connected to explain the powerful love the main leads naturally played out was amazing! I had so much fun watching this drama because of the different personalities and the crazy bipolar main actress. Yes, her screams and crying were annoying, and especially her yelling mad me want to slap her. However, it was understandable and you eventually get used to it because it was obviously meant so her character could play the moody bipolar character she was meant to be. I loved her so much, because within all her flaws, she makes you love her, as much as you love the main lead whom you are predestined to fall in love with. The other characters were also amazing because they played their roles so well. My favorite were Oh Rin on and the secretary. The only flaw this drama had were the damn flashback which was of course essential to the show, but I swear there was two or more that were repeated so much that the audience had seen it like a hundred times. Last, but not least the soundtrack was perfect. There was one which was often repeated that made want to cry. I wish I knew its name. Drama was definitely a 10 for me and I definitely recommend it.