Randy, a young artist with outstanding talent for painting, has been diagnosed with autism since childhood and is often accompanied by Harlan, a lovely and warm-hearted dog, in adoptive families. Self-reliance on extraordinary talent and uncontrollable emotions due to illness make Randy often speak falsely and challenge worldly vision, but under the mask of madness actually hides his kind and pure heart; when the beautiful and moving Siana walks into his life, Randy's world can't shake ── for the first time. He must find a balance on the emotional roller coaster before he can continue to surpass himself and draw his masterpiece of life.