Chan Joo is a woman trying to forget about her past by getting married. Jin Se is a man trying to start a new family by marrying Chan Joo. The two are now married to each other and go on to live ordinary lives. As time goes by, they grow bored, and long to go back to the past and try something new. This secretive longing sets their memories on fire, and they begin to seek their old lovers. They regain their identities as they get excited after meeting their old flames. Meanwhile, their marriages begin to crumble. After wasting time and effort, they eventually realize that true happiness resides in the everyday life of a typical marriage… Even though this seems somewhat disappointing, they realize that this is an undeniable truth about relationships and love between those that are married… (Source: JTBC)