胡多多（孙坚 饰）个性谨慎而又胆小，表面看来平平无奇，实际上一肚子的鬼主意，却又因为内向和腼腆，而常常招致他人的忽略。邓小余（包贝尔 饰）智商一般，性格则是没由来的乐观和开朗，虽然常常因为矮小的身材收到同学的欺负，但天生心大的他从来不会将这些事情放在心上。这迥异的两人在大学校园中相遇了，组成了处处惹是生非的二货组合，倒也十分相称。 　　邱樱子（陈妍希 饰）是学校里公认的校花，容貌姣好成绩优异的她这四年里少不了优质男生追随其后，但邱樱子却不为所动。周游（郑恺 饰）拥有高超的智商，是活跃在黑客界的知名人物，现实中，他一直都在和老师斗智斗勇。毕业季将近，每一个人都希望自己最后的青春能够燃烧绽放出最绚丽的焰火。

Deng Xiaoyu and Hu Duoduo , who are idle on the university campus, dream of performing a gorgeous counterattack on the prom, but didn't want to cause ridiculous and embarrassing incident that caused a sensation in the whole school. Qiu Yingzi, the school's cute flower has been pursuing true love fo four years, unexpectedly receives a mysterious gift. Zhou You has been fighting an old teacher with his quirky spirit. On the eve of graduation he discovers shocking secret. In a blink of an eye, graduation is approaching, whether various mysteries could be revealed or not before it.