A cheerful school campus... Mysterious incidents occuring... Rain, puddles of water here and there... Wearing a long skirt, a pale barefoot woman steps through the puddles towards the cold and isolated school building... Ms. Park Ki-Sook is left alone in the teachers's office scanning her class diary anxiously... The sun rises and shines o the school... Jio and Jay, who come to school earliest, find their class teacher hanged in an old tree. The new teacher, Mr. Oh Kwang-Goo, is an evil one nicknamed 'Crazy Dog'. He lavishes great attention on So-Young, who has a good family background, and despises Jung-Sook, referring to ger family. Easygoing Jio, who doesn't care about her schoolwork, is Crazy Dog's number one target for assault. In the midst of a panic-stricken rumor, Jung-Sook, not able to stand the teacher's insults, commits suicide and Crazy 
Dog vanishes during his night duty. Meanwhile Eun-Young, who has returned to her old high school to teach literature, keeps hearing the messages Ms. Park Ki-Sook left on her telephone the night before she died.. 'Jin-Joo is here. She has been coming to school.'
(KoBiz)