The film is composed of clips of footage shot in 2010-2015. The first clip: filmed in 2015, the daily study and life of Datong Youzai Primary School. The second clip: filmed in 2013, the state of the city of Taixing Daxing civil engineering transformation. The third clip: filmed for 2010-2013, on the eve of graduation and the last youth moments passing by. Fourth clip: filmed for 2010, the time we spent in a rental house during the summer vacation.