This is a great character based drama that depicts a male lead with Dissociative identity disorder (DID) stemming from a traumatic event in his childhood! There is no good vs. evil, the main lead’s persona split into two personalities, one that is cold hearted and cowardish in order to protect himself and one that is warm, understanding, and brave. The lead male actor (Hyun Bin as Gu Seo Jin/Robin) did such a great job that one totally forgets that he is still one person. This drama’s plot starts with Gu Seo Jin unexpectedly meeting Jang Ha Na which becomes the trigger to Robin’s (Gu Seo Jin’s alter ego) reappearance. From henceforth, and through a series of unfortunate events, this man starts on his way of healing, reconciliation, and falling in love. It has a good ending but the drama could’ve used one more episode to strengthen the lead couple’s relationship. Still, it is a great drama with many good actors playing their characters very well and a fantastic antagonist. Enjoy it!