Six-year-old Qing Yan saw an inconspicuous banyan tree in the park with a hole in it. Qing Yan remembered what her mother had said. Hide your wishes in the tree hole. Soon after, Qing Yan discovered that Dai Xian also had the same "little hobby" as himself, and the two became familiar but unfamiliar pen pals. But the good times didn't last long, and a car accident broke the peace of the past...
Concept: That person in youth must have created the beauty of your memories