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At Haneul High School, an old bell tower hides a terrifying secret. Every night at exactly midnight, the bell rings once—and the next day, a student disappears. Hana Seo, a quiet girl whose sister vanished from the same school three years ago, begins hearing the bell before it rings. When a mysterious transfer student arrives who seems to know the truth, Hana must uncover the dark secret behind the midnight bell before someone else disappears.