[Machine Translation] The dainty high school girls are terrorized by the fear of voices in this sad and beautiful ultimate horror film. The underground machine room of Songwon Girls' High School is full of gloomy sounds. Yeon-On and Sung-Min are best friends who make this their secret hideout. Unlike Sungmin, who is so full of energy that she takes on the role of announcer for the school's broadcasting team, Yeon-On is a quiet girl who doesn't stand out except for her excellent singing ability. On a late night, Yeon-On stays in the empty music room to practice her singing, and between her songs, an unfamiliar voice comes in. It is a harmony that envelops the gray schoolyard. That night, Yeon-On was murdered. Only the voice of her murdered best friend wanders around, and nightmares attack! The setting is a girls' high school. The film is full of highlights such as school uniforms, class scenes, and singing scenes! The making-of featurette includes the girls' true faces!