Yosan Private High School's homeroom teacher is injured, so a substitute steps in. After weird events, class president Ye-Rim (Kim So-Hyun) investigates Han Bong-Gu (Uhm Ki-Joon).
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Yosan Private High School's homeroom teacher is injured, so a substitute steps in. After weird events, class president Ye-Rim (Kim So-Hyun) investigates Han Bong-Gu (Uhm Ki-Joon).
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