The rational star is Lin Wei, the paintbrush star orbits Zhou Jin. A sketch hides the heartbeat, and a cherry blossom letter touches the unspoken confession. When the physical formula collides with the light and shadow of oil paint, with the help of friends and Stardust Cat, a youthful equation about reason and throbbing is quietly staged. However, the forked road of growth and the unknown future are pushing this pure light and shadow into an unknown storm.