Title: Whispering Corridors (1998)
Starring: Lee Mi-Yeon, Kim Kyu-Lee, Park Jin-Hee
Director: Park Ki-Hyung  
Studio: Bitwin 
Rating: PG 
Genre: Horror 

Synopsis:

In lively ground of a girls' high school. Mysterious incidents happen there...... The schoolyard on a rainy night, waterholes hollowed here and there. When a pair of white barefoot wearing a skirt tread down the waterholes, the ghastly school building stands alone and a woman teacher Park Ki-Suk is remained alone in the teacher's room browsing through her teacher's notebook with anxious look. Bright and sunny schoolyard. Ji-Oh and Jae-Yi, the first comers, finds their teacher in charge(Park Ki-Suk) as a body hooked on an old tree. The new teacher in charge is evil man Oh Kwang-Ku whose nick name is mad dog. He makes a favorite of only So-Young whose family background is excellent while he insults Jeong-Suk, the ever 2nd grader, even mentioning her family circumstance. Ji-Oh, who is broad-minded and through with studying result, is the first object of beating of the mad dog. While Panic-stricken rumors spread out, Jeong-Suk commits suicide due to unbearable humiliation of the teacher in charge, and the mad dog is missing during night watch. Meanwhile Eun-Young, who is assigned to her old school as a literature teacher, can't forget lingering Park Ki-Suk's message left in her telephone the night before she died.... "Kin-Ju is here. She still studies in school..."

taken from : http://www.dvdasian.com/cgi-bin/dvdasian/whispering.html?id=3wWzT7Tp
 
IMO:
the first of the ghost story of girls high trilogy... the more popular being wishing stairs... okay la, watchable...