Idiot Girls and School Ghost: School Anniversary

A failing high school student named Ji-yeon accidentally watches a 1998 VHS tape of her predecessors playing hide-and-seek with a ghost in the school. She discovers that all of them received perfect scores on their exams, and that since she has seen the tape, she must play with the ghost or be haunted by it. When she shares this information with her failing friends, she never imagines that they will deliberately watch the cursed tape to force her to play and give them a chance to pass their exams.