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Chen Xin, an ordinary girl in the fourth grade of primary school, has been living with her grandparents because she is a left-behind child. The life between three o'clock and one line every day made her feel boring until two boys appeared, one named Yue Chi and the other named Liu Chen. The two of them are good friends. Yue Chi is very cheerful, which makes Chen Xin not feel lonely; Liu Chen is very calm, which makes Chen Xin gain confidence in her studies. After the three graduated from college, Chen Xin and Liu Chen got together, and Yue Chi opened a dessert shop and became the owner.