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.
Wishing Stairs is a 2003 South Korean horror film. It is the third installment of the Whispering Corridors film series set in girls high schools, but, as with all films in the series, is unrelated to the others; apart from a song being sung in one scene that is a pivotal plot point in Voice.