Lee Shin-ae

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.

Ga-in, a high school student, witnesses the deaths of her relatives who die from a curse. Once she finds out that she is the next target, she asks her boyfriend to help her break the spell.