After being abandoned by her fiancé, Li Jianhua, the rural girl Jiang Qing comes to her senses and resolves never to depend on a man again. When she opens her eyes once more, she has returned to the day her fiancé heads back to the city in the 1970s. She snatches back the jade pendant she always wore from Li Jianhua and publicly breaks off their engagement, drawing a clear line between them. To secure the opportunity to take the college entrance examination, she throws herself into developing corn germ oil. Her dedication and hard work impress the technician Shen Zhiyan, who offers her his full support, helping her break through one obstacle after another. As the truth about her identity gradually comes to light, Jiang Qing discovers that she is the Su family's long-lost biological daughter. Li Jianhua suffers the consequences of his own actions, while Jiang Qing changes her name to Su Qing, establishes herself through her technical expertise, and takes complete control of her own life.