The paths of two university students cross on a Japanese beach during their summer vacation.

Park Jihyo likes to win, there’s no doubt about it. The only obstacle to that is Minatozaki Sana, her fellow law student who always seems to find a way to one-up her without even trying.

Sana and Nayeon have a routine, but maybe it's time to change that.

During a late night shift at the convenience store, Dahyun catches a pretty stranger climbing the roof to look at the stars. Instead of turning her in, Dahyun decides to join her.

When Jihyo gets called down to the principal's office in the middle of a study session, she hopes it has something to do with her recently missing student ID card.