Song Ji-Hyo
Yun Jin-seong
A staircase leading to the dormitory of a remote boarding school usually has 28 stairs, but every so often there appears to be 29. When someone steps on the mysterious extra stair, the horror begins.
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Song Ji-Hyo
Yun Jin-seong
Han-byeol Park
Kim So-hee
An Jo
Eom Hye-joo
Ji-Yeon Park
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Dance Teacher
Ji-min Kwak
Dance class junior
Ji-Yeon Lee
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Kong Sang-Ah
Kyoung-Jin
Su-a Hong
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