Khru Phensri, the devoted principal of Nongmaeped Witthaya School, is desperate to save her school from closure. In a final push before an important assessment, she hires a stunning new English teacher, Khru Lady. But soon after Lady's arrival, the school’s chickens are mysteriously slaughtered—and Phensri catches her eating raw entrails.

Convinced Lady is a ghoul, Phensri becomes determined to expose her. But Lady’s warmth wins over the students and staff, and even Phensri’s sweet younger brother, Khru Boy, begins to fall for her. Now, Phensri faces a dilemma: protect the school—or protect her brother from a teacher who may not be what she seems.