The story takes place in the 1990s. Qiu Shui (Han Geng), a medical student, and his dormitory friends Hou Pu (Zhang Boyu), Huang Qi (Yang Di), and Xin Yi (Zhao Yiwei) earn pocket money by writing martial arts novels while playing tricks, studying, and having fun. He once had an unforgettable first love, and now he enjoys campus love with Bai Lu (Qi Xi), an extremely self-disciplined girl. An unexpected encounter made him meet Liu Qing (Fan Bingbing), a beautiful woman full of mature atmosphere, and the following series of events made Liu Qing break into Qiu Shui's life. He intentionally or unintentionally hid the fact that he was dating Bai Lu, and on the other hand, he laughed and talked happily with Liu Qing in ambiguity. Youth has sweetness and regrets. It is precisely because it cannot be repeated that every joy, anger, sorrow, and happiness are so unforgettable and unforgettable... This film is adapted from Feng Tang's novel.