Choi Ban-Do (Son Ho-Jun) and Ma Jin-Joo (Jang Na-Ra) are both 38-years-old and a married couple. Choi Ban-Do has been burdened with being the breadwinner and Ma Jin-Joo is a housewife with low self-esteem. Even though they loved each other when they married, they now hate each other. They both regret marrying at such a young age. The couple travel through time and find themselves as 20-year-old university students, when they met for the first time.
