In high school friends wedding, Chen Xun (Eddie Peng decorated) occasionally recall our first party fennel (Ni Ni decoration). He met her on the high school campus, experience the palpitating with excitement eager to do sth. first life, also began a decade of fetters. In memory of the intermediate from high school to university youth, raging from the millennium to SARS, their feelings of germinating, sublimation, finally reluctantly end. They and his friend Qiao Ran (Wei Chen decoration), Lin Jiamo (Zhang Zixuan decoration), Zhao Ye (Zheng Kai decoration) together, as a microcosm of 80 after a generation, once common I won't change any day for love, stick to our original the innocent; also have together been the fate, because do not want to give up and be tortured covered all over with cuts and bruises. In the passing years, they grow strong adult, but helplessly lost each other. This paragraph of unforgettable memories, and now 30 year old Chen Xun feel regret in life, find the courage to let the young age, he is determined to start again, follow the memory clues square anise, to pursue in life that sunlight bright energy-saving. The film is based on the novel of the same name in nine night fennel.