Seo Kang Joon did a good job of playing a dual role. The human was a real jerk and the robot was lovely. I tend to like to watch actors show their acting chops by either playing two disparate roles, or by changing completely from the beginning to the end of the drama. I just didn't find the storyline that entertaining and believable. I'm all for being willing to suspend disbelief, but I just couldn't believe that she would be satisfied with loving a robot. It seems awfully sad to me. This is one of those shows that I had such high hopes for, and was so disappointed.