Fashion designer Soo Yeon is an attractive and talented as well as sexy woman who is always working and doesn’t care for marriage. Then one day she suggests to her boyfriend, Cheon Ta Pyeong, to live together on a contract. She writes down the conditions of a contract that involves the fact that they sleep together once a week. Then one day, Yoon Min Woo, a wealthy plutocrat who used to be Soo Yeon’s boyfriend, shows up and he tells her he wants to start over with her. She hides the fact that she’s living with Tae Pyeong and dates Min Woo. Tae Pyeong soon senses something’s up when Soo Yeon starts arriving home late and refuses to have sex. Soon after, Soo Yeon breaks up with Tae Pyeong and asks Min Woo to marry her, but she can’t help but feel something missing inside her.