A brilliantly executed story with a wonderful cast- quite unlike any kdrama I've seen so far. Was doubtful about how exactly they'd make things work, but I need not have worried. Perfect. Makes one wonder about how life would be with AI so closely knit with us in society. Intriguing, to say the least.

AHHHHH the ending (●'◡'●) I can't believe it's over. I really want to see a season 2 of this one.

It's unique some topics are handled better than others but that's not the point. It's very good. It mixes Fantasy and drama together very well. It's got a good cast and wonder what could happen if humanity made different choices.

this is such a wonderful storyn the best plot twists are out there, i cried my heart out at the ending, totally fooled watching this, and not predictable, i started it when i just started watching kdrama but i didn't continue and i decided to rewatch it and it's the best thing i did, literally a top must watch for kdrama lovers, this is a masterpiece, the whole concept is a masterpiece, it looked so good, every aspect of it, of the most perfect kdramas i have ever seen, don't hesitate to watch it, i promise!!