Two men fall in love with a woman whose life is a complicated web of lies, propelled by her greedy desires that stem from an unfortunate childhood.

Kim Hyun Joon is an assassin who belongs to a top secret organization known as the "NSS" whereas T.O.P is an assassin who works in another secret organization located in the United States called "IRIS" and was ordered to kill Hyun Joon. Seung Hee is a psychological analyst who plays an important role in bring Hyun Joon into the "NSS." Jin Sa Woo is Hyun Joon's enemy and falls in love with Seung Hee as well.

Baek Soo Chan has nothing in his hands but he lives a life under the belief that he will become the man any woman who sits next to him wants. However, his belief is questioned when he starts to realize true love. When playboy Baek Soo-Chan he finally meets his match with Jung Yoon-Hee. He goes absolutely crazy! His once blissful life of messing around with women has become something of the past every since Yoon Hee started to make snide remarks as she tries to protect her older sister from being trapped by his playboy ways. Yoo Joon Suk is the heir to his father's very successful company. He is forced to come back and take over his father's company when his father suddenly collapses. Yoon Hee then becomes Joon Suk's assistant and falls for her boss. Will Joon Suk return her feelings and will they be able to be together despite his mother's objections?

"Rosemary" is a drama that portrays an ordinary woman with two adorable children, who has just been informed on her terminal illness. While readjusting her surroundings, the woman becomes more aware of love for her family and is reminded of her modest but happy life. This drama has a trace of genuine human touch in that it gives you an opportunity to sense the importance of life through the eyes of terminally ill woman, where ordinary events are portrayed with beauty and inspiration. "Rosemary" goes beyond presenting the life of a terminally ill woman. It involves a woman who tacitly prepares for death, and her husband who deeply regrets his past for not having fully expressed his love for her. It also involves an indiscreet young woman who has to take care of the dying woman's children. Through their experiences, "Rosemary" helps us to reminisce on the true meaning of life.