Whispering Corridors 3: Wishing Stairs (2003)

Whispering Corridors 3: Wishing Stairs 2003 / 여고괴담 세 번째 이야기 : 여우계단 2003 / Yeogo Goedam Se Beonjjae Iyagi: Yeougyedan , Yeogo Goedam 3 - Yeou Gyedan , 여고괴담 3 - 여우 계단

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)