A group of high school friends reunited 20 years later to reminisce about their fearless and joyful youth. Xiaofang meets her old friend Meirong, the leader of the Mustang Gang, a small group of six girls from high school. After learning that Meirong has cancer, Xiaofang decides to find the other four members of the Mustang Gang to fulfill Meirong's last wish. In the process of searching for her best friend, Xiaofang also recalls the good memories of high school...