This drama is based on webcomic “편의점 샛별이 / Convenience Store Saet Byul” written by “활화산 / Hwalhwasan” and illustrated by “금사공 / Geumsagong” which was published from 2016-Aug-11 to 2017-Dec-8 via Toptoon. It’s about 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. Choi Dae Hyun (Ji Chang Wook) runs into a group of female high school students, including Jung Saet Byul (Kim Yoo Jung). The girls look like troublemakers. Jung Saet Byul asks Choi Dae Hyun to do an errand for them, which is to buy cigarettes from a convenience store. Choi Dae Hyun buys the cigarettes for them and Jung Saet Byul gets his cellphone number, but he never gets a call from her. 4 years later, Choi Dae Hyun is now 33 years old. He runs a small convenience store after he quit his job at a large company. He is looking for a part-time worker to work the night shift at his convenience store. Jung Saet Byul comes to his store and she soon starts to work there. She is not a troublemaker anymore. Jung Saet Byul is now a university student and guided by her strong morals.