After her ex-boyfriend dumps her to marry the boss's daughter, Cha Eunseo swears off love and gets a job at a rival company for a fresh start. But her plan goes awry when she has a one-night stand with her new sexy CEO, Lee Wonwoo! Eunseo runs from the hotel, leaving behind a heel that Wonwoo uses to find her. She wants nothing to do with him, but his interest in her only grows. With such a fervent suitor, can Eunseo stay away from love? Or can Wonwoo bring her the happy ending she wanted?