A former troublemaker applies for a job at a convenience store owned by the same man who ran errands for her a few years ago.

Jung Saet Byul is a 22-year-old four-dimensional girl with amazing fighting skills who loves her friends, family, and retro fashion. She has the boys lined up but only has one person who keeps her distracted, Choi Dae Hyun. He became imprinted on her as an unforgettable person after a cigarette errand three years ago. Three years later, Jung Saet Byul meets Choi Dae Hyun again at his convenience store that he now manages and becomes a part-time worker. Here, Saet Byul and Dae Hyun's love story begins as they heal the wounds of the heart, gain love, and become adults dreaming of the future. Their stories unfold into a pleasant comedy within the familiar sensibility of a convenience store.

It's a romantic comedy where Choi Dae-hyeon meets Jeong Saet-byeol as a part-timer at his convenience store. A pretty college girl came to Dae-hyeon's convenience store to do a late night job. This is Jeong Saet-byeol, a high school girl who gave Dae-hyeon a surprise kiss for a cigarette errand. Dae-hyeon is under stress as sales go up with male guests coming to see Saet-byeol. Despite all the tricks of Dae-hyeon, Saet-byeol likes him. A love story by Jeong Saet-byeol, an unusual girl, will be played at a convenience store.