The plot for this drama is so incredibly original, unique and new but its full potential sadly isn't reached.

The only thing I can pinpoint as lacking is the length of the series.
Don't get me wrong, the crew and cast did an amazing job at bringing it to life. There's unique camera work, the imagery of the color rush and the decoloring is well-done, the dialogue is interesting and the protraying of the two main leads was very good! But it pains me to have to admit that, if this wasn't a boys' love drama (or not a KOREAN boys' love, other countries tend to make them longer), the story would've been stretched to at least double the length it is right now. And it would have done a great job at exploring more of this unique world!
Looking at how little footage there is, it's unbelievable that the plot doesn't feel rushed or forced, a feat that I put up to the natural dynamics that were already there. The series could have used some extra scenes, just to satisfy my liking for domestic/candid interactions. But even though those weren't there, the story still feels genuine and progresses naturally. So that's incredible!
But still, knowing that the story could have easily been double the length, makes me frustrated with the way it is now. Aside from that, Yeon Woo's mother's disappearance is just completely forgotten about? So that was kinda weird.

The handle on the plot is really well done! The writers did a good job at working the details out and I liked the focus there was on the obsessive nature of monos. It might've felt a bit too much for some people, but I write that off to, once again, the length. If it was longer, Yeon Woo's obsessiveness might have progressed a bit more naturally, but the way it is now was well done in the circumstances. But back to the plot, the obsessive part is very real and I'm glad it wasn't avoided! If I imagine being a mono, it feels very normal that I'd become obsessed with literally the one (1) person who makes me see color. The returned fascination Yoo Han has due to his face blindness makes it work out for them, since it's like, as Yeon Woo says, a double miracle. I really liked the simultaneous aloofness and shamelessness of Yoo Han and Yeon Woo's internal dialogues do a good job at underlying the struggle he's having. The friends bring a nice and entertaining dynamic to it, even if they're not that present.

In conclusion, I wouldn't mind a future remake or special in which more of this world is explored, but until then I can just rewatch this one over and over (the only good thing about it being so short).