Choi Dae-hyun runs into a group of female high school students, including Jung Saet-byul, who look like troublemakers. Saet-byul asks Dae-hyun to buy them cigarettes from a convenience store, but he buys them candy instead and gives Saet-byul his number. She never calls him.
Three years later, Dae-hyun runs a small convenience store after resigning. While looking for a part-time worker to work the night shift at his convenience store, Saet-byul applies for the job and starts working there.
References:
🏪 Wikipedia
🏪 AZLyrics
🏪 KGasa