It's really a great drama... hats off to the writer for his imaginary level..
It's totally different from other fantasy dramas...

But the only thing I feel it's negative is the plot where a human and a robot developed a relationship...tough the robot is a positive character, it doesn't fix the reality for such kind of relationship. It makes the female lead look too naive .

It's also their relationship... that made this drama a fantasy one...Since it can't happen in reality.
Still I loved the story plots and this drama a lot....
This team has done a great work that made this drama outcome as a positive one.