May is a sex worker. She works very hard for her son who sufers fatal disease and her old mother with senile dementia. She accept every single clint and gives them sex service, which makes her neighter, ma sir, feels shamed about her.

Now May is despairately harassed by telephone nuisance at midnight. Ma sir is assigned for this cases. After long time investigation, he finally finds out it comes from three workers. However, the three workers are acquited and become more acquitive. They rape May and kill her for anger.

May, who dies with great pain and regret, become a horrible ghost, coming back to live, beginning her bloody revenge...