A Teenager's Diary

Lu Ang, comes from a middle-class family. His parents are too busy at working to lack communication and companionship. Yu Ming, comes from a single parent family. His father thinks that punching and kicking is the best way to educate him. They have different troubles and similar loneliness. Lu Ang and Yu Ming saved Zheng Wanhe, a transfer student, in a campus violence incident. They established friendship and joined the school chorus together. However, their families are in crisis. Their parents are about to divorce. Their grandmothers are cheated by health care products. Their sisters are attacked by pedophiles. The two have a new understanding of life after their parting and death.
Starting from the growth of two teenagers with different personalities, the story explores the practical problems of education in China from the perspectives of campus bullying, child sexual abuse, middle-aged crisis and many other social issues.

本片是一部探讨家庭教育的青少年成长电影。
故事围绕两个家庭展开，中学模范生路昂成绩优异，但父母忙于工作缺少沟通与陪伴。同班的后进生余铭性格调皮捣蛋，父亲认为拳打脚踢是对他最好的教育方式。余铭的妹妹小扣子今年七岁了，她对于“自己是从哪里来的”有着奇怪的误解，保守的父亲对女儿的性教育难以启齿。
学校里要举办文艺汇演，路昂希望父亲来观看自己演出，父亲却认为他不务正业。余铭不想让父亲来，他害怕同学们发现父亲外卖员的身份。
晚会排练如火如荼的展开，但他们的家庭却危机四伏：路昂的父母面临中年危机，余铭的奶奶遭遇保健品诈骗，小扣子遭到坏人绑架！
少年们在经历了悲欢离合后对人生有了新的认知......