Zhang Kai (played by Chen Sicheng) is an obstetrician and gynecologist with superb medical skills. Because of his handsome appearance, he lingers among various beauties all day long. He is a typical philandering scumbag. Xiaolan (played by Jiang Mengjie) is a pretty nurse in the obstetrics and gynecology department. She is infatuated with Zhang Kai. Because he has too many girlfriends, the romantic Zhang Kai has a frivolous attitude of just seeking happiness without asking for results, and he lives happily. Meiling (played by Liu Yun), Yin Qiaowen (played by Li Xinru), Ji Chenyu (played by Wei Lai) and Liao Chunxi (played by Huang Xiaolei) have all had love stories with Zhang Kai for varying lengths of time, but they are just embellishments of Zhang Kai's happy life. Suddenly one day, a mysterious email containing a B-ultrasound test report shocked Zhang Kai. Frightened, Zhang Kai suffered from sexual dysfunction. On the advice of a psychologist, he decided to find the child's mother. After narrowing down the scope layer by layer, Zhang Kai locked his destination in Lijiang. Zhang Kai's younger brother Zhang Xin (Bao Beier) is a big boy with an IQ of only seven years old. He dreams of going to Shangri-La to find his first love. Under his mother's entrustment, Zhang Kai takes his younger brother Zhang Xin on a journey to Yunnan to find someone...