Choi Ban Do and Ma Jin Joo 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.

Strangers living together at the Samkwang Villa get to know each other and even fall in love.

While looking for the cryptic creator of an innovative augmented-reality game, an investment firm executive meets a woman who runs a hostel in Spain.