Yu Suwan's father is framed by his company and sent to prison. Three years later, her strong-willed mother refuses to stay in Lin City and face people's gossip, so the family moves to Cang City, a third-tier city. In her second year of high school, Yu Suwan is forced to transfer, and her long-held dream of pursuing art school is put on hold. In her heart, she keeps the piano, the moon over Lin City, and a boy named Shen Yubai. Later, Shen Yubai fails his college entrance exams, and his mother sends him overseas to study. He doesn't even have time to say goodbye, let alone confess his feelings. Yu Suwan can only bury the boy and the landscapes of her hometown in a thick diary. Four years later, that boy stands before her, smiling brightly, and says, "It's been a long time."
Theme: About youth and regret, growing up and loss
