Haru has a secret. She has the ability to go back to a fixed point in time every time she gets married. One moment, Haru is standing at the altar. But suddenly, she’s back on the subway on her way to work. But this secret of hers turns out to be not so secret after all. Oneul, who has the same ability, meets her and tells her that she and Oneul are both players in a dating simulation game.