[1][2] In the late '90s, screenwriter Oh Ki-min had written the screenplay for Whispering Corridors and showed it to various production companies, but the film was rejected by all of them.
The producer thought that an all-girls high school was an attractive setting, stating that "It's a space that stimulates male curiosity, a place that men have never been in but are fascinated by.
The films don't share any direct links with each other, due to the producer wanting Whispering Corridors to be a "brand name".
[3] In an exclusive all-girls school, a former pupil returns to start a new job as a teacher and strikes up a friendship with two very different students.
But when a teacher is found dead, apparently having committed suicide, circumstances that link the past and the present begin to unveil themselves.
As the body count rises, the memories of past deaths begin to call forth a series of ghosts to haunt the corridors of this troubled school.
Although startled by this supernatural development, Sun-Min adapts rather quickly to the situation and tries to uncover the reasons for her friend's untimely demise.
But Sun-Min's absolute faith in her dearly departed friend is soon shaken when a plague of mysterious deaths start to occur on campus!
After her sister Eun-ju (Kyeong-ah Jang) commits suicide by jumping from the roof of her school building, Jeong-eun (Shin-ae Yu) chooses to investigate the unexpected incident further.
Speaking to three of her sister's friends she is told that the four girls had previously made a suicide pact and that Eun-ju was the only one to fully commit.