故事开始于虚构的中国最东边的小岛“东极岛“，一个智力低下的青年胡生（高华阳 饰）讲述了关于他的两个哥们儿——马浩汉（冯绍峰 饰）和江河（陈柏霖 饰）的故事。马浩汉在外闯荡多年后回到故乡，却发现全岛面临着拆迁问题，而他最好的朋友，岛上唯一的老师江河也将被调到更为偏远的地区。于是马浩汉做出了一个决定，那...就是开车送江河去三千多公里外的学校报到。于是他们踏上了前所未有的旅程，途中他们见了当临时演员的童年玩伴周沫（陈乔恩 饰），误入歧途的苏米（王珞丹 饰），还有马浩汉心仪多年从未见面的笔友刘莺莺（袁泉 饰）泉 饰），以及放荡不羁的摩托车手阿吕（钟汉良 饰）。看似平常的旅程却暗藏伏笔，马浩汉和江河最终走到了终点，开始了截然不同的人生轨迹。
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