What I liked:

+ the freaking story is so different and unconventional from the usual k-dramas. We have had mermaids, aliens, time-travellers, vampires and now the next big thing are robots! I really like how they're touching on the genre of inter-species romance, as it is something that is quite taboo and not always taken seriously.

+ it's unpredictable. I swear (so far at ep 28), every freaking episode has never stopped surprising me.

+ the acting is phenomenal namely by Seo Kang-Joon, playing two completely different roles & he delivers it very realistically.

+ character development is amazing! you can see how the characters learn and grow throughout the series.

+ the music matches with the atmosphere and context of the drama/scene. I personally love their OST by Lim Ji Eun called 'The Longing Dance'; it gives me shivers by just listening to it!

What I disliked:

- the political/power struggle scenes is a little boring (for me personally) to watch, but is equally important to be able to understand what is going on
- some of the characters may annoy the crap out of you but you either see them develop/change or they remain that way, either way it's some really good acting
- it may drag at the beginning but the story does pick up its' pace as you keep going

All in all, like it or not, I would say give it a chance. Although right now I have no idea how the show will end, but I think it's still worth a shot :) x