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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.

This series is rated Teen. Please review the Content Ratings page for more information.