In Beijing, three families preparing for the college entrance examination are not only facing the pressure of further study, but also facing the difficulties of parent-child relationship. The mother Tong Wenjie (Hai Qing) who hates her son's poor academic performance and her son Fang Yifan (Zhou Qi) have many conflicts over their grades, and the father Fang Yuan (Huang Lei) has to mediate; the single mother Song Qian (Tao Hong), who refuses her ex-husband Qiao Weidong (Sha Yi) to invade the lives of mother and daughter, has launched a comprehensive concern for the life of her daughter Qiao Yingzi (Li Gengxi), and misunderstandings and conflicts have quietly erupted unconsciously; the sudden care of the airborne father Ji Shengli (Wang Yanhui) and mother Liu Jing (Yongmei) makes Ji Yangyang (Guo Zifan), who has been raised by his uncle Liu Zheng (Ren Zhong) since childhood, feel at a loss. The cautious relationship between father and son has not brought peace to this relationship. In this important trial of the third year of high school, the middle-aged parents and the children who have just entered adulthood have overcome the many difficulties set by life, learned to grow in love and understanding, and ushered in their own "little joy".