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**SPOILER** Love Hyun Bin as he showed some serious actor skills in this drama. The story and concept are original, full of actions, suspens, love story... you have it all. I took off a star though, as Jang Ha Na character became selfish and nosy in my point of view, wanted to have a relationship with the 2nd personality of Seo Jin, Robin, without caring of the happiness of Seo Jin, who had to sacrifice himself and listen to the person he loves talking about someone else, living in his house, etc....I found this very heartbreaking in the story. Fortunately, at the end, it was fair and logical for all the characters and finally Seo Jin could be happy, even though he should have fallen for someone else ;) To watch!