This is a youth story about secret love. It is unfolded from a third-person perspective. It tells the story of a sensitive girl with low self-esteem who falls in love with a boy who looks like the moon. He is cold and bright. Congratulations on winning the prize, but unfortunately it has expired. Then they become just passers-by in each other's lives. He is like the moon in the dark night, and she is like one of thousands of stars. She accompanies him. Secret love in youth is like a green apple, bitter but sweet.