Jung Eun-ae, whose life goal is to marry Jin-hong—an undeniably perfect boyfriend—and to build a family anyone would envy. Growing weary of her boyfriend, who fails to fill her loneliness, she finds herself drawn to her senior, Lee Jae-won, who, despite his seemingly indifferent demeanor, is surprisingly considerate. Despite knowing that he is a married man, she begins to feel an attraction toward him, and in order to have him, she consciously—or perhaps unconsciously—starts to shatter her own moral beliefs one by one...