"Insiang" is Lino Brocka's tale of one girl's coming of age in the slums of Manila. The title character, played by Hilda Koronel, is a young girl who lives in a small crowded shanty with her mother, Tonia (Mona Lisa). Her boyfriend Danny (Rex Cortez) treats her little better than a sex object and her mother's lover Dado (Ruel Vernal), overcome by desire for young Insiang, rapes her in her own home. She runs to her mother for sympathy but gets rejected instead. Disillusioned and worn out, Insiang decides on revenge.
Insiang has the distinction of being the first Filipino film to be screened at the Cannes Film Festival in 1978 where both Lino Brocka and Hilda Koronel garnered much attention and acclaim from the international film community. The film also earned a number of important awards and nominations including the Manila Film Festival Best Actress for Hilda.