This drama is about a married couple who constantly fights. They regret getting married young without consideration. One day, they travelback to their twenty-year-old selves. Choi Ban Do (Son Ho Joon) 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.