

A staircase leading to a schoolgirls' dormitory usually has 28 steps, but sometimes a 29th step appears. Any wish you make while standing on this step comes true, even if it must come true in the most horrific way possible.
Acting
Song Ji-hyo's transformation from meek to menacing is delicious.
Practical Effects
The 29th step reveal uses simple effects that still haunt.
Director
Yun Jae-yeon
Trivia, insights & behind the scenes
This is the third film in the 'Whispering Corridors' series, but each installment is standalone with no shared characters.
The 29-step myth references actual Korean school ghost stories from the 1970s-80s, when corporal punishment in dormitories was widespread.
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