I want to start by saying I hated the FL in the first few episodes because she was a liar, and was doing bad things for money, but slowly she begins to realize her errors and you can empathize with the things she has been through. I think her character development was done in a good pace, so it takes a few episodes for her to become likeable.

The same goes for a lot of the other main characters - there is a lot of grey lines in their morality values, and at points you are not sure which characters you should actually be rooting for.

The whole point of the show is to question what it really means to be human, and it explores how artificial intelligence could connect with humans and evolve according to the kind of humans that develop it and control it.

The romance between robot/human might seem weird if you've never been exposed to something like this, but I've seen other media that explore this topic, so it wasn't totally new. It was very mild in that sense, but it was both sweet and intense and painful (which I like for some reason). If you like slow burn romance, tragic star crossed lovers type of stories, this might be it.

Side note: No one can convince me that Ji Young Hoon and the human Nam Shim are not actually in love (the hand touching, the painful longing looks and the fact that they are each other's most important person... come on!).