Shanghai youth Yang Yishan enrolls in a university in northeastern China. Upon arriving, he receives enthusiastic help from senior student Zhao Duoduo, only to find out it's a paid service. Due to an unexpected inspection by a teacher, Duoduo hastily leaves her small cart, her treasured tool, with Yishan for safekeeping.

Yishan finds an anniversary booklet in the library, discovering that his parents are mentioned in the records of the student film club, with his father being a founding member. Meanwhile, Duoduo, wanting to conduct her business smoothly on campus, goes to the Youth League office and registers a new student club called the Entrepreneurship Club.

After buying gym equipment, Yishan encounters a drunken Duoduo at the bus stop. Initially reluctant to help, he intervenes when she nearly gets hit by a bus. Grabbing her waist to prevent an accident, Duoduo reflexively slaps him.

In a large lecture class, Yishan is distracted and worried. Duoduo also attends the class, answering roll call for seven different students with varied expressions and voices, fooling the professor. Noticing her acting skills, Yishan chases after Duoduo post-class and asks her to help him deceive his aunt.

Duoduo and Yishan conspire to drive away his aunt by exploiting her discomfort with northeastern customs. They plan around Yishan's own unease with the communal bathhouse, but Duoduo miscalculates.