Invisible 2: Chasing The Ghost Sound (Movie - 2010)

Source http://movie.daum.net

Her voice which I hear everyday…
When all five syllables match, real terror will dawn!

Geum-ja is a woman living alone after she lost her husband and sister in a car accident. One day she starts to hear her dead sister’s voice inside her house so she calls a mystery team from a broadcasting station with an acoustician team. But the mysterious sound suddenly disappears and an acoustician team tries to leave the house due to the conflict. While the broadcasting team was packing up, they hear strange sound from 5 spots in the house.