Choi Ban Do (Son Ho Jun) and Ma Jin Joo (Jang Na Ra) are both 38 and married to each other. Since their marriage, Ban Do has been burdened with the responsibilities as the sole breadwinner while Jin Joo is a housewife coping with low self-esteem. Having tied the knot at a young age, the pair find themselves regretting their decision and start to despise each other. One day, they travel back through time and find themselves as 20-year-old university students when they met each other for the very first time.
