Yay, It's review time!
The moment I completed the final episode, I jumped onto here to share my thoughts. The reason for this review enthusiasm probably comes from the dislike / like relationship I'm currently going through.
( not strong enough to say it's a love/hate type one )
I can best describe this show as a roller coaster in the best and the worst ways. I know I'm going back and forth with my words a lot, so let me just cut to the chase...

Story 〆(・∀・＠): The synopsis, in the beginning, already handed me a plate of good feelings. And the trailer was merely the cherry on top. It seemed so light-hearted and comedic, which is what I thought it would be for most of the show. The beginning matched my expectations, but the mood completely took a 180 in the middle. It became less of a romcom and more of a melodrama. The reasoning behind everything made sense, so it didn't feel forced, but it kind of saddened me to see the characters upset for such a long time. Every time I thought some resolution came, another problem just popped into existence. The show's mood then did another 180 near the end, which bought a bit more of the comedic aspects back. Even though I didn't have that big of an issue with the sudden mood changes, It is definitely surprising considering how I thought everything would play out. Another thing is the questions that I had to ask myself. In the beginning, a lot of stuff just kinda happened, and they wouldn't fully explain things. I had to make educated guesses only to have the answer revealed to me halfway through the show. That doesn't mean there were many plot holes in the end, but it was still a bit irritating to have to deal with. Other than those two things, I didn't have an issue with the story. It was touching to see the characters grow and the impact they had on each other. It makes you value family and the people around you so much more.

Acting ｡゜(｀Д')゜｡: Crying... so much crying. I use the same symbol face for whenever I talk about acting, but this time it really reflects what was happening. The acting was phenomenal, especially by the three main leads. I'm not going to lie, this was the first time I encountered these actors. I didn't have an opinion on them going in, but I'm speechless now that I'm out. Yoo Sueng-ho, just.... so much emotions. He cried enough to flood a city but smiled so brightly that is dried up before causing any damage. Sueng-ho was so fantastic at conveying the character's emotions to the point... I just don't really know how to explain it. Not only did he put his heart and soul into this character, but he mastered the development that came with it. How he entered and left the show was so different but in the best ways. I can honestly go as far as to say he became one of my favorite actors. Chae Soo-bin was also spectacular. Her whole appearance just suited that of a robot ( not in a bad way, of course ). She just has such a doll-like face. In my opinion, at least. Besides her looks, the girl is talented beyond belief. Like Sueng-ho, Soo-bin had to show a character slowly put pieces of a puzzle together and change each time she got closer to the finish. It doesn't make much sense when I say it, but the small changes she showed as the story progressed were gratifying to watch. And finally, the mad scientist himself. I particularly liked how Uhm Ki-joon took on the character of Hong Baek-gyun. He wasn't your run-of-the-mill genius scientist and showed himself to have insecurities too. All three of them worked so well together. So props to them all. What brings the score down was the foreign actors. I don't understand why one of the antagonists needed to be from a different country. He could've been Korean, which wouldn't have changed much besides making the show a bit less awkward. I am a native English speaker (despite my sucky writing), and I felt a bit uneasy at some parts. Just the delivery in some lines was so awkward, and they didn't seem like experienced actors. I also had to listen to Korean men speak English. I get English isn't an easy language to pronounce, so I felt bad for some of the actors who clearly didn't have much experience. I could barely make out what some were saying and just looked towards my English speaking villain who seems like a tourist they brought off the street.

Music ヾ(⌐■_■)ノ♪: The acting part of this review was a bit too long... I know. I'll make the music portion a bit more quick and straight to the point. There was bubbly and upbeat music at happy times and slow emotional ones during sad times. There was one song that I thought had a few refreshing versus, but nothing too exciting. It was just really basic background music. No need to go looking for it on.... I dunno... Spotify?

Other (ง°ل͜°)ง: Gaaaahhhh! Here is the part where I need to vent a bit. But don't worry, no spoilers. The robot part of the relationship..... aaaah. So much of this show was Kim Min-kyu and the "robot" Aji-3. The chemistry was adorable, not going to lie, but I couldn't find myself appreciating it as much. To me, it seemed like a relationship entirely built off of lies. Although they do discuss this later on, so much of the show was just me itching at the chance to jump into my laptop and fix things. I know that it's very much impossible, but it still bugged me regardless. And for the robot looking exactly like someone's ex-girlfriend. That made me a bit... uncomfortable. Not too much, but it definitely made me hover a bit.

Although this review is a bit all over the place, thanks to my messy brain, I hope this made sense.
I never got bored while watching, but I did get irritated and confused a lot. The romance is sweet, but it is also so much more emotional than what I'd thought it would be. I guess the sudden changes in the show's overall mood made me feel a bit more on edge.
I'll be heading out now but do give this show a try. It's different than other romcoms, but it also holds such a deep meaning on family and the relationships you can have with others.
So although I may have been shocked a bit, I can finish off by saying I did enjoy watching this.
And hopefully, you'll be the same.
Happy Watching <3