The young and promising doctor Ji-Hwan and the lively Dan-Fang are a couple. When the two people who are talking about marriage arrange for their parents to meet, misfortune begins to befall them from this day. It turns out that Yi Sun-Ji, Ji-Hwan's mother, and Xu Youyi, Dan-Fang's father, were once a married couple. Yi Sun-Ji scrimped and saved so that her husband could finish university and have a bright future. Unexpectedly, Xu Youyi fell in love with Miss Kim Hee-sook from a wealthy family and divorced Yi Sun-Ji. Perhaps as a retribution, when Xu Youyi and Kim Hee-sook got married, their family business started to decline and eventually faced bankruptcy. Meanwhile, Yi Sun-Ji concealed the fact that she had been married before and remarried her current husband who doted on her, living a rich and happy life. Unbeknownst to her, after more than twenty years, her son Ji-Hwan brought home the daughter of her sworn enemy, and she absolutely could not agree to this marriage!