On the day of the group project presentation for the first semester,, Lee Seunghyun is falsely accused of being a pervert while on the subway on his way to university, causing him to miss the presentation and ruining his grades. Desperate to recover to a critical 3.0 GPA for job applications, he scrapes together enough money to enroll in a summer course. The class, once again, involves a group project, and he discovers that 'Seo Chaejun, a junior in the same group who hasn't been attending class, is the same guy who falsely accused him of being a pervert. 'In this precious summer of my senior year, what on earth did I do to be dealing with this crazy guy and this bullshit?