Monochromatic people (known as 'Monos) live in a world where they are unable to see colour and therefore view their surroundings through varying shades of grey, black and white. However, every Mono has a fated person…
Imagine living in a world painted entirely in shades of gray—no blue skies, no green grass, no red roses. That's the reality for Choi Yeon Woo, a 'Mono' who sees only monochrome. His life changes when he transfers to a new high school and meets Go Yoo Han, a charismatic and impulsive classmate who wears a mask over half his face. As they grow closer, Yeon Woo begins to experience sudden bursts of color whenever he locks eyes with Yoo Han—a phenomenon known as a 'Color Rush.' But there's a catch: Yoo Han is a 'Probe,' a person fated to bring color to a Mono, and their bond is rumored to come with obsessive, dangerous consequences. Torn between the exhilarating rush of seeing color for the first time and the fear of losing himself in an all-consuming connection, Yeon Woo must unravel the secrets of his mother's disappearance and decide if the vibrant world Yoo Han offers is worth the risk. This visually stunning and emotionally charged film blends mystery, romance, and a touch of psychological tension for a truly unique BL experience.