This drama is very deep. It teaches us the meaning of being a human being and, in the end, we understand that it doesn't matter who we are, how we look or what our gender is (even our own humanity as a biological component is put aside), because everyone can have humanity. At the end of the story it comes out that, as ironic as it may seem, a robot can be more human than us! Executive Director Seo is also an example of a human without humanity and if we try comparing him with the AI Nam Shin III we'll soon realize who's more human than the other.
Besides of that, every character of this show is absolutely perfect and the acting was amazing. The producers of this drama really did a good job.
(A special thank you for his hard work goes to Seo Kang Joon and his wonderful acting)