The story begins in the 303 dormitory of Shanghai University. Lin Xiangyu (played by Chen Xiao) has a carefree personality and is not afraid of other people's eyes. Although he is a second-generation rich man who has returned from overseas, Li Dapeng (played by Du Tianhao) only cares about his pet alpaca. Xie Xun (played by Li Xian) is strong but delicate and gentle. Guan Chao (played by Liu Ruilin), a scholar with high IQ but lack of female affinity, these four big boys from all over the world gathered here and became roommates who lived together day and night, opening the prelude to a university life with laughter and tears. The short four years will pass in a blink of an eye. Standing at the crossroads of life, what choices will the four make? Can Lin Xiangyu pursue the "Silk Handa Girl" he has always cared about? What will be the ending of the relationship between Xie Chuan and his girlfriend Gao Baojing (played by Lan Yingying)?