Living with a neurological blindness that limits his ability to see color, Yeon Woo (Yoo Jun) 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 (Hur Hyun Jun) comes crashing into his world.