Sunshine's re-study student returns to the high school campus and faces the lonely top student across the table. With the common goal of getting admitted to Beijing, an adult "social big brother" brings an introverted and simple "aloof academic master" to learn to socialize and learn how to dress up? The girl who lives in isolation gradually learns to grow up under the sunshine of youth, learns to love to laugh, and also learns to have a secret love in ignorance.