Okay, this is probably the cutest and fluffiest drama you can think of. I wasn't really sure whether I should start watching it but after seeing like only two posts about it on tumblr, I knew that I would love it.

STORY
The story itself is kind of unbelievable but at the same time perfectly put together.  I've noticed that the story summary was a little bit unappealing to most people, even I was questioning myself whether I should give it a try, but the plot really turned out to be interesting.

ACTING/CAST
The acting was flawless! I was very surprised how the actors perfectly portrayed emotions of their character, especially Yoo Seung Ho who plays Kim Min Kyu. I seriously enjoyed his acting the most and he was the best thing about this show, to be honest. My heart was constantly breaking either because of the heart-breaking scenes or because he is the most adorable being and he should be protected.
Chae Soo Bin did also a great job of portraying a human and a robot. I honestly really enjoyed all the Ji Ah moments as all the Aji 3 moments. Not to mention the amazing chemistry between Yoo Seung Ho and Chae Soo Bin. Of course, we can't forget about my favourite Santa Maria research team, which grew to my heart and I really loved how in the end, everyone was basically a huge cute family.

MUSIC
I don't have much to say about the music. It wasn't something extremely amazing, but the songs were okay and I liked some of them more than the others.

OVERALL
I definitely recommend this drama and when I get the chance, I'd love to rewatch it. Even though the story wasn't that perfect, it was well put together and the acting + messages couldn't be better! The whole chemistry of this show also really made an excellent impression on me.