Ning Yi Zhao (Park Ji Woo) is a survivor-a pragmatic optimist. She's spent her whole life moving from town to town with her flighty mother, struggling to make ends meet and believing that someday she'll climb out of the gutter. After her mother's death, Yi Zhao is truly alone. Until Lee Soo Man appears, plucking Yi Zhao out of poverty and suddenly she's named Park Ji Woo, tossing her into his posh mansion among his five sons who all hate her. Each Lee boy is more magnetic than the last, but none as captivating as Lee Jaemin, the boy who is determined to send her back to the slums she came from. Jaemin doesn't want her. He says she doesn't belong with the Lee's. He might be right.