在这部谁的青春不迷茫爱情片中,林天娇（郭姝彤 饰）是同学和老师们眼中公认的三好学生，不仅学习成绩优异，道德品质的高洁更是有目共睹。然而，在一场非常重要的考试之中，林天娇因为患上了感冒而发挥不佳，心急如焚的她想到了作弊，然而却因为作弊技术太差而东窗事发。
让本以为一切都已经结束了的林天娇没有想到的是，同班同学高翔（白敬亭 饰）竟然替自己背了这个黑锅，要知道，高翔是那种林天娇最瞧不起的捣蛋王讨厌鬼，好吃懒做游手好闲简直一无是处。就这样，林天娇和高翔之间开始产生了奇妙的羁绊，林天娇越想远离高翔，就越是有一股奇妙的力量将两人凑在一次。随着时间的推移，两人都渐渐发现了彼此内心里不为人知的柔软一面。
Lin Tianjiao (Shutong Guo) is the top girl in her school. During one of her tests, she resorted to copying from notes, and is spotted by Gao Xiang (Jingting Bai), who is considered a wayward student. When the note was discovered by the teacher, Gao Xiang chooses to claim responsibility for trying to cheat. Lin Tianjiao feels apologetic towards Gao Xiang, and begins their friendship. Meanwhile, Lin Tianjiao's good friend, Lu Tiantian (Herun Wang) is courting Ou Xiaoyang (Guansen Ding). However, due to his poor academic standing, Lin Tianjiao ignores him completely. Classmate Huang Tao (Hongyi Li) is secretly in love with Lin Tianjiao, but is too shy to express it. As a result, he and his best buddy, Li Tao (Wenlong Zhao) are at loggerheads with Gao Xiang. The relationship between Lin Tianjiao and Gao Xiang develops, as she begins to understand Gao Xiang better. Knowing that she likes astronomy, Gao Xiang buys tickets for an Astronomy Exhibition and dates Lin Tianjiao. Lin Tianjiao's mother insists that Lin Tianjiao focuses on her school work, and does not allow her any time off, any allowance for friendship. As a result, Gao Xiang never gets to go on the date with Lin Tianjiao. Meanwhile, as an act of love for Lin Tianjiao, Gao Xiang steals into the Astronomy Exhibition at night to take photographs of the place. He is arrested and forced to quit school. Before he leaves, he and his band of friends from the local auto-shop steal into the school to paint astronomical images on to the walls and ceiling of the classroom that Gao Xiang and Lin Tianjiao studied in. At the award of the best student award to Lin Tianjiao, Huang Tao tells her that Gao Xiang is leaving town. Lin Tianjiao uses the opportunity of the award speech to tell of her selfishness as she sought the award. From ignoring the feelings of Lu Tiantian (and her relationship with Ou Xiaoyang) and her brother, Lin Ziao; as well as her good friend, Gao Xiang. She then declines the award, and leaves the auditorium to rush to the train station to bid farewell to Gao Xiang. Unfortunately, she misses Gao Xiang. She (plus her brother, Lu Tiantian and Ou Xiaoyang) run into Gao Xiang's friends from the auto-ship, and hitch a ride to the local radio station, where Lin Tianjiao uses the programming to say farewell to Gao Xiang (singing The Beatles ' song "Hey Jude"). After a few years, Lin Tianjiao is a famous astronomer. She gave up on her mother's plan for her to study finance in Tsinghua University, but decided to follow her own dreams of doing astronomy. She plans a trip to Africa, hoping to meet Gao Xiang in Africa. Meanwhile, the rest of the group meet at Huang Tao's wedding, with Li Tao as his best man. Lu Tiantian and Ou Xiaoyang are still courting, and Ou Xiaoyang is intending to propose to her.
迷茫的不是青春，是你们回望时失焦的眼神。。拍青春片的导演们，能不能把我们的青春还给我们。青春电影也迷茫。谁的迷茫不青春。依然等待那份真实的青春。越是沉重，越是飞翔。青春片是否只是属于优等生和差生。还记得年少时的梦吗？。握好现在，直面未来。人生不是活给谁看，也不是想怎样就怎样。
