The ten-year-old girl Lee Sun (played by Choi Soo-young) was isolated and excluded at school by the girls' group headed by the girl Bora (played by Lee Soo-in) because of her poor family. The day before summer vacation, Li Shan met Han Zhiya (Xue Hui), a girl who was about to transfer to school in the new semester, in the school corridor after school. The two...