Sang Jin and Hye Jeong are attracted to each other instantly. Hye Jeong is dead set against marriage and so only agrees to live with Sang Jin who holds an opposite view. Hye Jeong agrees to the living arrangement on one condition that she will not have sex with him. Sang Jin initially accepts this condition with a confidence that he can convince her otherwise. But when a third party enters the picture, things start to go bad for the couple. When their contract expires, so does their relationship…