I'm glad I found this series.

It has an interesting theme - people who only sees colors when their probes are with them.
I've heard and read a lot of story with similar themes, soulmate AUs where people are color blind and only are able to see colors when they found their soulmate; also that's the sign you found your partner through life. But they were never like this, with this kind of twist where you experience de-coloring when you are not with your probe. This makes monos desperate and obbsessed because once you got a taste what it's like to see actual colors you never want to see the world only in gray again.

I loved Yeonwoo's and Yoohan's characters. Yoohan was a sweet guy who cared for Yeonwoo despite the fact that he was a mono and Yoohan knew monos got obsessed with their probes sooner or later. He didn't care for that one bit - why is that we only got the answer at the last episode. Honestly I wasn't prepared for this turn of events.
Yeonwoo dear, he was so scared that one day he'll be like the other monos in the news who kidnapped and killed their probes! But he was a kindhearted guy and always thought of others before himself . Though I don't approve of the way he wanted to protect Yoohan from himself, at least he remained true to his word that he didn't want to harm Yoohan in any way.

The only not so positive thing I have to say about Color Rush are the plot and the animation.
The plot would have been good -it was good in many ways -, but I felt it rushed. Like... what happened to Yeonwoo's mom? Did they managed to find her in the end? We only got little bits of informations about her and her dissapearance and the overall case. I would have liked to have a more elaborate story. And I know, the series itself is short, so they focused on the main characters and the main plot but this could have been so much more detailed in the little things like this if Color Rush would have more and longer episodes. This goes with Yoonhan's background too. We got like 2 sentences about his family in the last episode and that's all.
As for the animation. It was a bit -okay, at first a LOT but it got a bit better with time-, cringe-y to watch the color rush scenes. Those rainbow sparkles around their faces was soo weird. I couldn't get to used to them.

And just to touch the OST topic too.
You have to give this OST a chance because it's fantastic. It went very well with the drama and I have a feeling I'll be lsitening to it more in the future.