The stories in this series revolve around the members of two families that have strongly contrasting backgrounds. One is a traditional patriarchal family (Ha family) trying its best to uphold the reputation of its family name, while the other is a nouveau riche family (Lee family) that got wealthy from loansharking and other shady business dealings.
Most of the plot centers on the relationship between the youngest granddaughter of the Ha family, Ha Dan-ah (Yoon Jung-hee), and the son of the Lee family, Lee Kang-suk (Park Si-hoo). Dan-ah bears the emotional burden of being widowed at a young age, and is unable to let go of the memory of her husband who died in a serious car accident. She has several unpleasant encounters with Kang-suk, an unscrupulous businessman whose main aim in life is to defeat his opponents in the business arena. A strange turn of events brings this unlikely duo together in a mock dating game, which turns serious as both parties find themselves changing for the sake of the other.
The two main sub-plots focus on the romantic relationships of Dan-ah's twin brothers. The elder is Ha Soo-young (Jeon No-min), a mild, placid man who meets and falls in love with a girl several years his junior (Shin Da-eun). The second brother, Ha Tae-young (Kim Sung-min), is impetuous and outspoken, and finds his match in a tomboyish policewoman (Maya).
As relationships develop and paths cross, the fates of the Ha and Lee families become closely intertwined. In the events that follow, the beliefs and values of both families will be challenged, secrets will be unearthed, and new ties will be forged.