The Shadow of the Senior Next Door?

She always appears in an empty classroom late at night. Her diary is filled with countdowns, and whenever we meet, she seems to want to say something but holds back. Driven by curiosity, Lin Mo begins investigating and gradually gets caught up in a series of bizarre incidents: exam papers vanish into thin air, an old school uniform mysteriously appears in a locker, and the rumored “Shadow Senior” roams the school building. As his investigation deepens, Lin Mo discovers that all these events point to an unpublished campus tragedy from twenty years ago.