High school student Hailey and biology teacher Ryan are hiding their secret relationship. If exposed, she would face expulsion and he would lose his job. When twin transfer students Ethan and Zoe arrive, Ethan—who once witnessed the pair at a wedding—seizes the leverage to blackmail them. Holding a grudge over a past case, Ethan is bent on revenge against Hailey. Hailey's cousin Danny joins the school as a PE teacher and develops an ambiguous relationship with Zoe, becoming another bargaining chip in Ethan's hands. At a party, Ethan drugs Hailey; Danny's intervention is caught on video. Ethan keeps stirring conflicts and reveals that the criminal Marcus from years ago was someone close to him, gradually unveiling his true motive for revenge.