This is not just a documentary. From 2012 September onwards tracking shot the film electrical engineering Zhejiang University, a big four boys dormitory until 2013 July graduated so far, about four ordinary boy in the face of this at the crossroads of life lost, hard, choices and nostalgia. In the movie four boys share an identity: Engineering male, but each person's personality and fate yet so different. To each and every one of them, four special this year big that they finally have the opportunity to truly face their own choice; as for the audience, which may be a starting point for us to reflect on the education.