Wishing Stairs Dts

in a female boarding high school there is a mysterious stairway with twenty eight steps near the dormitory the twenty ninth step will appear when someone reaches the end of the stairway if you make a wish at that particular moment your wish will be granted yet peculiar things will ensue so hee and jin sung are very good friends initially and they support each other they get trained together at a ballet team at school because of jin sung s ambition their relationship begins to fade meanwhile there is a great opportunity to further study at a famous ballet school in russia but only one ballerina can go in order to get the spot jin sung approaches to the eerie stairway and make a wish in the hope of beating so hee eventually her wish is granted and she is able to go to russia nevertheless in return so hee tumbles on the stairway and then dies afterwards subsequently their classmate hye joo reaches the stairway to make a wish that so hee can resurrect from death but hye joo is possessed by so hee from then on terrifying incidents happend one after another