Hyo-joo, an untenured instructor at a boys' high school is assigned to a class of seniors as a HR teacher. She notices that a specialized dance student Jae-ha is absent from the self-study session, and finds him practicing refined dance movements in the gym. The next day Hae-young, the school board chairman's daughter arrives as a tenured instructor, which was the position assumed to be offered to Hyo-joo soon. Hae-young, sweet and having grown up with no worries, treats Hyo-joo with affection, but Hyo-joo only gives her the cold shoulder. Then one day, Hyo-joo witnesses Hae-young and Jae-ha in the gym, locked in a passionate embrace, and from that moment on, she starts feeling an inexplicable sense of humiliation towards Hae-young while gradually falling under the influence of Jae-ha's elusive charm.

★愛情沒有對錯？南韓導演金泰泳禁忌話題作挑戰台灣觀眾

★如果下跪能保住工作？國民女神金荷娜演繹失格的人性黑暗面

★上課太無聊？李源根為戲練舞、獻出大銀幕首次床戲

★令人屏息的曖昧氣氛、出乎意料的結局，極致虐心愛戀

高中約聘老師朴孝珠(金荷娜 飾)在學校地位低落，教務主任總以「續聘」、「終身教職」當作指派朴孝珠更多工作的藉口。

某日學校來了一位新任老師秋惠英(柳仁英 飾)，年輕貌美、又是學校理事長的女兒，秋惠英很快成為這間男校的焦點，也順理成章的拿下該校僅剩的一名「終身教職」職缺。朴孝珠對秋惠英的一切感到嫉妒與自卑，當她意外發現秋惠英跟男學生(李源根 飾)正在秘密交往，她決定展開復仇行動……她要奪走她的一切，不計後果……