The film is based on Rao Xueman's novel of the same name and tells the story of a young girl, Yu Chizi, and her childhood friend, Duan Bowen, about the secrets of their youth.
- Arthur ChenDuan BowenMain Role
- Ouyang NanaYu ChiziMain Role
- Ou HaoZhang YangSupport Role
- Zou YuanqingSi Jia LiSupport Role
- Mi MiLi ErSupport Role
- Yong MeiMother of ChiziSupport Role
- Zhang YaoDong JialeiSupport Role
- Cao WeiyuFather of BowenSupport Role
- Rong ZishanDuan Bowen(Young)Support Role
Seventeen-year-old Duan Bowen lost his mother at a young age and is at odds with his stepmother.
In the school, he meets "Xiao Er Duo" and falls in love with the "young and pretty" teacher, which is his biggest secret.
But what he doesn't know is that his childhood friend, Yu Chizi, likes him. That is Yu Chizi's secret too.
In her sophomore year, Yu Chizi finds that her friend Si Jia Li has an unusual relationship with Duan Bowen, and she also discovers Si Jia Li's secret.
So Yu Chizi devises an elaborate plan to get back at Si Jia Li, but the truth of the matter surprises her.