Insiang (1976)

A love triangle leads to a crime of passion as an innocent slum girl, Insiang (Hilda Koronel), is transformed into a scheming, ruthless woman by harsh social and physical conditions and by here even harsher experience. After being raped by her mother's live-in lover (Ruel Vernal), Insiang makes the lover fall in love with here, so that the mother (Mona Lisa) would be forced to butcher the man in a gruesome fit of jealousy.