"So, did you sleep with that guy or not?" After being cheated on by her ex-boyfriend, Yoo Byeol took a solo trip to Spain, where she met a man—Sunwoo—and spent a questionable night with him. She thought she’d never see the guy who left such a strong impression again... But then she runs into him back in Korea—at her workplace, no less?! And to make things worse, her ex is also at the same company...?!