At seventeen, Lin Shen is a cool-headed top student burdened with family responsibilities. Drawing is his quiet way of expressing himself. Su Tian is a bright, sunshiny art student whose paints hold her boundless imagination. A late arrival on the first day of school sends them racing into each other's worlds, and from deskmates to partners in the art club, the gears of fate begin to turn. Pencil marks in sketchbooks mingle with the vivid colors on their palettes, while the sweetness of orange candies quietly melts away the boy's defenses. As they compete for scholarships and experience the first stirrings of young love, the weight of family troubles collides with the warmth of friendship. Together, they sketch out a future on canvas: with starlight as their witness and paint as their medium, the summer of their seventeenth year holds the sweetest secret. An entanglement with the basketball team, a friend's timely interventions, and an unexpected encounter on a sketching trip all add distinctive strokes to their youth. This is their story: amid days woven from paint and starlight, two teenagers use their brushes and their hearts to create the brightest colors of youth.