"Eureka!" 'Hyunsu' was an aspiring filmmaker. He encounters 'Miju' and offers her a role in his film, and while filming they fall in love. "Are you even doing anything?" Time passes, and now, Miju is tired. It's hard to make ends meet, her superior is mistreating her... Miju is frustrated with Hyunsu who is still just daydreaming. A single comment turns into a huge fight, and the next day, the two experience completely different 7th of July, After the day ends, what ending will be awaiting them? Can we go back to the way we were?