When Yifan was in high school, he came to a small town called Xianghe in S City - his grandfather's home because of his father's job transfer.
I met Xia Yan, a classmate from Anning Town in F City. No one in the class plays with Xia Yan anymore. Occasionally the boys would play pranks on her, but she would just smile bitterly and say nothing.
Until you meet Yifan, everything will change.