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Chen Sanyuan, a girl from a single-parent family, has a red birthmark on the corner of her mouth. She has low self-esteem and is sensitive, and she has many gaps with her surly mother. Zhou Xizhi, a good student who was loved by his parents, had to face the death of his loved one. Xu Pingan, who comes from a superior family, worries about being confessed to by girls all day long. While the three of them are dealing with their own growing troubles, their friendship is also undergoing tests from family, school, and life itself. After the college entrance examination, the three finally ushered in their respective consummations, and their friendship was as good as before. All the good things seemed to have returned to their lives.