Backstreet Rookie EP14
One day, Choi Dae Hyun runs into a group of high school girls who look like troublemakers. One of named Jung Saet Byeol asked him to buy *********s from a convenience store. Choi Dae Hyun buys the *********s for them and Jung Saet Byeol gets his cellphone number, but he never gets a call from her.
4 years later, Dae Hyun quits his job from a large company and runs a convenience store. He is looking for a night shift worker.
Jung Saet Byeol comes to his store and she soon starts to work there. She is no more a troublemaker but a university student who is guided by her strong morals.
Based on the webtoon of the same name.