Fifteen year-old Xian goes to live with her father while her mother, a doctor, takes a job in Africa. Soon, she becomes fascinated by her father's stepdaughter, a swaggering, liberated and slightly melancholic young woman.

In 2000, Lin Zhiqiang and high school junior brother Liu Xiaojun entered high school together. The two of them became close friends with the lively Wang Jia and the carefree Chen Xi. The friendship and love between the four people were entangled with each other, and various ridiculous stories happened, and they passed through the youth time that they could not go back to.