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.
송지효
as Jin-sung
박한별
as So-hee
조안
as Hye-joo
박지연
as Yoon-ji
공상아
as Kyung-jin
이미연
as Se-on
문정희
as Dance Teacher
곽지민
as Dance Class Junior
Joo Eun
as Younger Dance Group Member
홍수아
as Sculpture Club Member
Lee Ji-yeon
as Radio DJ
이민정
as Jin-sung's Ballet Dance Double
