Guizhou province, southern China, spring 1980. Schoolboys Zhao Qiangsheng (Ma Guoxing) and Fulai (Wang Shibin), who've spent their whole life in a remote village, hear from a PLA soldier about a thing called a "city", full of people, buildings and cars, three mountains away. Full of curiosity, and with the orphaned Fulai fed up with being passed around the community, the two set off to reach it when their school is closed for five days...

改革开放之初，一辆卡车开进与世隔绝的山寨，带来了关于山那边的消息。一份印满城市照片的画报，点燃了两个少年对于美丽城市的憧憬。短暂的假期，强生和福来两个少年决定要翻过大山，去看看山外面美丽的城市，自此他们开始了一段神奇之旅。

　　途中，他们遇到了逃婚的女人晓娅（于娜 饰），三人一起上路。经历重重阻隔，他们终于到达了城市，晓娅也要坐火车回遥远的北京去了，这时晓娅的丈夫却突然出现要抓她回去。原来晓娅是从北京来的知青，迫于生活嫁给了村寨的农民。可是晓娅却始终不能忘记遥远的北京，在拿到返乡证离掉婚之后，她义无反顾的坐上了开往北京的列车。城市里的生活总是那么光怪陆离，让人摸不着头脑。他俩遇到了从村寨出来的青年龙建国（张涵予 饰），戴墨镜穿风衣的龙哥看起来不像个好人，他的脸上始终挂着显露出不易觉察的惆怅。龙哥对他们很好，不仅给他俩买了新书包，还要送他俩回家。后来，福来留在了城里的孤儿院，强生回到了美丽的村寨……