Whispering Corridors 3: Wishing Stairs

Jin Sung is a boarding school student and aspiring ballerina who desperately wants to get into a world-renowned arts academy. To improve her chances, she takes advantage of a local school legend: If a student walks up the dormitory staircase and counts all twenty-eight steps, a twenty-ninth step will appear—and a spirit will grant her a wish. However, when her friend suffers a horrible accident, Jin Sung realizes too late that she doesn't have control over how her wishes get fulfilled.
(Source: Rotten Tomatoes)