本片是一部韩国恐怖片，由Hyunsoo Lee导演，由Junhyung Kim主演。
剧情简介：In a class room, a girl is sitting on the desk, solving a math quiz. If she cannot solve it in time, a horrible thing is likely to happen. The clock is ticking but the quiz is not likely to be solved. And her mechanical pencil breaks down. However she has to solve the quiz.
外文名：A Function
类型：恐怖 / 短片
地区：韩国
导演：Hyunsoo Lee
演员：Junhyung Kim
