Usually I'm not into completely romantic dramas, where the only story and action sorrounds the two main leads and there's nothing else apart from this, but I have to confess that I liked this one. It's cutteness in action! There is a great chemistry between the main actors. I know a lot of you will wonder, who is going to believe that she is a robot? but ok, Kim Min Kyou had been alone all his life, so I really believe he was such in need of people that he could believe anything in the world.
Acting: they are amazing. Funny and sad scenes, you can feel them through the actors.
Music: I like the three or four songs. They were fine with the drama.
If you have some time to watch it, do it! it worths the time.