"So, did you sleep with that guy or not?" Yu-byeol, left alone in Spain on a trip due to her cheating ex-boyfriend, spends an uncertain(?) night with a man named Sun-woo. Thinking she would never see him again after he left such a strong impression, she reunites with him in Korea—and even at her office?! To make matters worse, her ex-boyfriend is also at the company... ?! With only 90 days left for Sun-woo, who came to Korea on business! Their romance without a visa begins!