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Eight-year-old boy Xiao Guang lives with his maternal grandmother. Grandma signed Xiao Guang up for an after-school piano class, But Xiao Guang doesn't like learning the piano at all. Every week, he also has to go to the piano school for a check-up lesson with his teacher. At the piano school, Xiao Guang has two good friends—Long Long and Jia Jia. During their lunch break, the three of them would go to the nearby bookstore to read comic books,But one day, someone messed up.