29 years old, Baek Dohee who feels hopeless and skeptical about her life, dreams of escaping from a frustrated heart, meets Jun Won in place of her friend, Nuri. Due to an unknown attraction they end up having a one night stand, but at the climax. Dohee passes days without meeting Jun Won inorder to forget that day. Dohee reunites with Jun Won, who has taken the position of team leader. However, Jun Won who shouldn't be able to remember "that day," clearly remembers Dohee and everything that happened that night. No matter how hard she tries to push him away , she's still dragged towards him who approaches her recklessly. Can the two who became emotional hedgehogs for their own reasons, will be able to break down the wall and be happy together?

Dohee is too busy girl-bossing her way up the corporate ladder to care about love. Her ability to randomly time loop makes her professionally successful but also renders all relationships meaningless. What's the point when she'll have to restart everything at some point?

That all changes when Joonwon, her annoying new boss, reveals that he can time loop too. Though she cringes at the mere sight of him, he's also the only person who understands her.

Will they learn how to find solace in each other, or will their professional friction mess up their one chance at love?