The lovely and promiscuous textile professor Eun-sook has all the male professors wrapped around her finger. It also helps that she has slept with most of them. Eun-sook is also a member of an environmental awareness group. When the popular comic book artist Suk-gyu joins the group, he arouses the jealousy of Mr. YOO, one of the other member who fears that Suk-gyu will steal Eun-sook from him. It turns out that Eun-sook and Suk-gyu attended the same junior high school where they share a secret and tragic history. Back then, Eun-sook was Suk-gyu's older brother’s girlfriend. But after Eun-sook decides to sleep with Suk-gyu as well, the older brother's best friend dies in an accident in which both of them are involved. As the jealous MR.YOO starts to investigate Eun-sook and Suk-gyu's past, will their secret be kept? Will they get together again?