梧桐中学高二十八班是远近闻名的问题班级，后进生、艺术生、体育生、不良少年聚集在此，以宋宸（柯焱曦 饰）为首的男生帮派和以秦淼淼（熊婧文 饰）为首的女生帮派互相不服，班级混乱无序。一天，高二十八班收到了一封信，这封信自称是由一年后的他们集体寄来。信上说，即将调来的班主任谭 睿明（秦海 饰）会改变十八班，成为对他们最重要的人。然而在一年后的未来，谭老师却永远地离开了他们。为了实现一段没有遗憾的青春，扭转历史，少年们决定按照信上所说，挑战一个个不可能实现的任务...
Class 18, the notorious yakuza class in Wutong Middle School received a letter from their future selves one day. The letter accurately predicted what would happen to class 18 during their high school years, and asked the students to complete three impossible missions to save their sick math teacher. To avoid the misfortunes written in the letter, the bad kids called a truce and gradually developed a heartwarming relationship with the Math teacher on their journey to shift the track of history.
地道的深圳人青春。非常像当年的我们。高二十八，意气风发。笑着就哭了。至今唯一最真实感人的青春校园电影。青春，不应该被定义！。。。再见十八班。恩师桃李满天下，播撒种子终开花。久违的泣不成声。
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