A staircase leading to the dormitory of a remote boarding school usually has 28 stairs, but every so often there appears to be 29. When someone steps on the mysterious extra stair, the horror begins.
Director: Jae-yeon Yun
Writer: Soo-ah Kim, Shin-ae Lee, Soyoung Lee
Cast: Song Ji-hyo, Park Han-byeol, Jo An
