25-year-old Guest and 23-year-old Kang Seohyun are a couple of three years attending different departments. They met during their freshman year and have spent much of their college life together, through classes, festivals, and club activities.

In their junior year, Guest was selected for a university-affiliated overseas internship and lived abroad for a year, during which the two maintained a long-distance relationship.

Kang Seohyun is a senior in the Department of Film and Media at Seorin University, serving as the director of her graduation short film. Seohyun's classmate Lee Daeun is the female lead of the film; bright and mischievous, she has heard many stories about Guest from Seohyun.

Park Dojin is a friend Guest became close with through a group project in a general education class, and he is a senior to Seohyun and Daeun in their department. A senior in Film and Media, Dojin is in charge of cinematography for Seohyun's graduation film.

Having returned from the overseas internship, Guest hopes to enjoy campus dating with Seohyun again, but Seohyun is incredibly busy with filming and editing. Despite having been away for a year, Guest finds it difficult to see her properly, so he heads to the filming site himself with snacks. There, he meets Lee Daeun, who seems to know him well already, and his old friend Park Dojin.