The protagonist of the series "Backstreet Rookie" is a young, charming, and caring owner of a 24-hour convenience store who constantly finds himself in amusing adventures. One day, Choe Dae-hyun's father gets injured, and he has to find a new assistant for the night shift. At the interview, an enchanting beauty named Jung Saet-byul shows up, immediately captivating both the employer and his customers. However, he soon discovers that the cheerful girl is someone he has already met before...