Deep in the mountains in the 1970s, teenage girl Zhao Shuhe unexpectedly receives a complete collection of educational resources from the future. Her family is too poor to afford her further education, and she is on the verge of being hurried into an arranged marriage. By chance, she meets Lu Jingfeng, the head of security at the provincial capital. Impressed by her thirst for knowledge, he offers to support her studies. Seizing the opportunity, Zhao Shuhe earns admission to a technical secondary school and stands out with her exceptional foreign-language skills. She must catch up on outdated knowledge to fit the times and avoid giving herself away, while continuing her studies, helping her family leave the mountains, and riding the wave of a changing era. Through academic achievement and personal growth, she and Lu Jingfeng support each other and build lives of their own.