Ro-Ra (Jeon So-Min) is the daughter of a wealthy family. She has three married older brothers and her parents. She happens to meet bestselling author Ma-Ma (Oh Chang-Suk). He lives with his three older sisters. Ro-Ra and Mama fall in love and promise to marry, but Ro-Ra's father suddenly dies and her father's company goes bankrupt. Not knowing what is going on with her family, Ma-Ma misunderstands her.