Color Rush - All Seasons

Living with a neurological blindness that limits his ability to see color, Yeon Woo has grown up in a world that looks very different from the one most people are accustomed to seeing. Only able to decipher varying tones of gray, Yeon Woo knows the world is full of color but he has never seen them for himself. At least not until the day Yoo Han comes crashing into his world.

As if brought together by fate, Yeon Woo's life is forever changed, the day he meets Yoo Han. Falling for the boy's many charms, Yeon Woo is overwhelmed by the unexpected rush of emotions he feels, every time Yoo Han is near. What's even more surprising is the sudden rush of color that washes over the world, every time Yoo Han walks into the room. Could this be a sign that Yoo Han is his destiny? 

While Yeon Woo ponders his fate, his aunt Yi Rang (Yeon Min Ji) searches desperately for the sister who went missing years ago. Joining his aunt on her quest, Yeon Woo recruits Yoo Han's help and together they search for his mother. As they dig deeper into the mystery surrounding her disappearance, an unexpected story begins to unfold. Will these fated boys be able to solve the mystery of a missing mother while simultaneously unraveling the mysteries of their own hearts?

Based on the web novel of the same name by Se Sang, Color Rush is a 2020 mystery romance web drama.
 

Choi Yun Woo is a high school student and a "mono" – a person who sees the world only in a dull and lifeless black and white. But for every mono, there is a "probe" – a kind of soulmate who allows the mono to see the world in vivid color. Yun Woo's probe was a boy named Yoo Han, and the two developed a beautiful friendship that blossomed into romance. But as their relationship intensified, mysterious goings-on suddenly got very unpleasant for Yeon Woo, who eventually found that Yoo Han had disappeared, with his mother also vanishing. Yun Woo vows to do whatever it takes to track down his "probe" and his mother. A classmate named Se Hyun learns of Yun Woo's quest and resolves to help and protect him – as a close friendship develops between the two students. But Se Hyun hides a secret, and Yun Woo could be about to discover the truth… Meanwhile, Yun Woo is not alone – other monos are nearer than he might think, including a female mono who is looking for her own probe. And a TV producer is also on the scene, hoping to get to the bottom of the mono-probe mystery!