The first few episodes were excellent & I really got into it, but shortly after that the the story progression crawled to complete halt, I did not feel the comedy anymore & in each episode I kept asking myself when will he find out, when will all this pain end? There is a reasonable happy ending, but as many have said there are unanswered questions and overall it does not make me forget all the frustrations I've had before, nor is it satisfying enough to give the drama a very high score. I'm not surprised that the ratings tanked in Korea.
I watched this over the course of 2 days, I strongly believe had I watched only 2-3 episodes a day I would have enjoyed it a lot more. I guess there is a limit how much frustration one can deal with in a day.

I feel that this show was a huge missed opportunity. They had a great story to tell & a truly outstanding cast, but there were problems with writing & directing. Chae Soo Bin could clearly act like the perfect Robot, but for some reason, when she was only pretending to be one it felt so unconvincing. It should have been convincing at times and then going out of character for comedic or dramatic effect, but this did not really happen. They could have expanded more on the genuine Aji3, her escape was one of the highlights of the show, but she barely had any screen time. I was waiting for a necklace related scene during the ending, also a big disappointment.