Kim Jennie, a high school senior and a cheerleader gets herself entangled in a prom pact with the most unlikely person - Park Chaeyoung, a girl she's been helplessly crushing on for quite some time. The two girls, both without a prom date for different reasons, agree to go together - that is only if they're both dateless until the end of school year, which proves to be a lot trickier than some might think.

After Kim Jennie returns to Seoul nine years after an event that changed her life completely, a chance encounter and enrollment to a university takes her on a trip down the memory lane.