Shy and timid Yoo Seoyeong is desperate to get back at Min Jooyeon for ruining her life in high school, no matter how petty the revenge is. So when she sees Seo Jaeha, the gorgeous new department manager of her company and Jooyeon's fiance, she grabs the chance to seduce him into spending a steamy night with her. But what should've been a one-night stand becomes much more tangled as both Seoyeong's body and heart burns for Jaeha's affection. Will she walk out of her revenge plot unscathed? Or will she be scorched by the very fire she started?