In 1997, Dong Jiujiu (Zhang Hanyun), a class flower in the senior year of high school, looked like a sensible and obedient girl, but she was rebellious and eccentric in her heart. Her good sister Han Xia likes fashion design very much. She is outspoken and daring on weekdays, but she is often ridiculed by the boys around her because of her burly figure, ordinary appearance and manly character. The melancholy school grass Xia Jinghan (Ran Xu), the school bully Luo Fan (Dai Xu), the fat foodie Xiaoqiang (Zhang Zheng), and the athletic teenager Dawei (Li Xian) are recognized as the bad friends of the whole school. Facing the upcoming college entrance examination, they each look forward to their future life. Jiujiu's father suddenly passed away on her 18th birthday, but the birthday gift he left for her became her permanent spiritual sustenance. Jinghan is a righteous person. Because his parents divorced when he was young, he depends on his grandmother for life. Luo Fan is Jinghan's best buddy. They appreciate each other's chivalrous temperament, but Jinghan and Jiujiu's love caused a rift between the brothers. Han Xia, who looks ordinary, has always lived in the shadow of her best friend Jiujiu. The huge contrast between her and Jiujiu's attitudes by teachers and classmates has caused a huge crisis in their friendship...