Yun Jae-yeon

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.

After the co-host of a shopping channel TV show loses her job to a younger rival, she enrolls in an intensive yoga course. The very strict trainer informs her students that there will be serious consequences if they do not follow ...