유시후

Woojin works night shifts at a convenience store while preparing for the police exam. One quiet morning, while studying and cleaning, he sees a man attempting to steal the bag of a drunken, sleeping female student.

Ha-yoon has secretly had a crush on her friend Jin-woo for a long time. One day, she stumbles upon a post on social media that says, "If you confess today, you'll have 100 days left on Christmas." She decides to confess to Jin-woo, relying on the promise. However, the timing is always off, and Ha-yoon's confession is repeatedly postponed.