The good and bad thing about Korean BLs is that they are almost universally short and sweet, easily consumed in a few hours. And while typically a very pleasant diversion, they are often lacking when it comes to fleshing out the story, having fully developed characters, and wrapping up the story neatly. This drama suffered from all three issues, but I still very much enjoyed it.

Pros:
- The acting was overall quite solid I felt. Yoo Jun was definitely a stand out and the most consistent. He perfectly showcased his character's inner turmoil and I really appreciated how much emotion he managed to convey just with his eyes. His chemistry with Hyun Jun was also quite good and they played off of each other well except when it came to kissing. That was painful to watch. Hyun Jun was pretty good, though he seemed to struggle with some of the more serious scenes where he came off almost robotic at times. He did much better portraying Yoo Han's mischievous, cheeky side. Seo Hoo and Hyo Gi had smaller roles but were also quite fun and I enjoyed their addition.
- In terms of the story, there are both pros and cons to this aspect but for the pros, I found the world created absolutely fascinating with this concept of monos and their probes and I honestly would have loved it if it had been explored more in depth. This drama had some great scenes, but one of my favorites was when Yoo Han asked Yeon Woo to teach him the colors he saw. It was such a sad, but poignant scene and I thought it was done beautifully. I also appreciated the reveal of Yoo Han's condition at the end, that both boys were struggling with their obsession for the other, it wasn't just Yeon Woo, and how neither could bear to let the other go. Very interesting and overall well done on that front. The mix of dark and light, particularly towards the end was interesting and added some spice to things. There were some twists that I was not expecting but were handled quite well. The romance developed organically more or less and the dangling question of whether it was truly love or obsession made it more interesting.
- The OST was fantastic. The opening in song in particular really caught my attention and has already been added to my Spotify playlist.
- I really loved the media arts scene. It was a stand out for me just in terms of seeing the characters' development as well as just being a visual treat. Loved it. I also found the way they showed the color rush to be appealing. It's not what I was expecting but I found it to be quite beautiful and well done. I also appreciated the way they switched between how the rest of the world saw things with color and how Yeon Woo saw the world.

Cons:
- With the story, as I said before, there were both pros and cons. One of the cons is the world, which I loved, but I did feel needed a bit more exploration. I really wanted more info on the monos and probes to better be able to understand them. Another was the characterization. Considering the shortness of the drama, they did a good job of introducing the characters and giving enough background to keep them interesting, but, again, I wanted more, especially when it came to Yoo Han. I felt like, despite him being the second lead, we found out next to nothing about him and his life except at the very end and even that was pretty minimal. However, my biggest con in this regard is how the mystery of Yeon Woo's mother's disappearance just ended up on the wayside. There were a few other little side plots and such that were also neglected, but I felt that was the biggest one. I honestly got invested in her disappearance and thought the drama was going to be more of a mystery/crime type deal with the boys teaming up to find out what happened to her, but that didn't happen. In fact, we're left exactly where we started and I found that to be more than a tad disappointing. I know there's a Color Rush 2 that I've heard answers the question of what happened to her, so I may check that out, though the apparent of absence of Hyun Jun makes me a little leery of it.

And honestly that is my one con: the storytelling and the plot holes. I truly wish they had made this into a longer, more fleshed out drama because it had so much potential. It's good as a romance but I feel like it could have been much more than that. I wouldn't have objected in the slightest if the mystery of his mother's disappearance and learning more about the monos had been more of a focal point than the romance. That being said, it's a solid romantic story in terms of their developing relationship and I very much enjoyed it. Overall, it is absolutely worth the couple hours it will take you to watch and, due to its shortness, I would not object to watching it again at some point.