Gumapang Ka sa Lusak (English: You Crawl in the Mud[1]), also known internationally as Dirty Affair,[2] is a 1990 Filipino political thriller crime drama film directed by Lino Brocka from a story and screenplay written by Ricardo Lee.
Starring Dina Bonnevie, Eddie Garcia, Charo Santos, Christopher de Leon, and Allan Paule, the film tackles the abuse of power and evil acts committed by Edmundo Guatlo and his cruel wife Rowena in which Rachel, a movie actress who is his mistress, and her friends try to expose his scandals and violent acts done by him and his wife and even his henchmen to the public.
[1] This was one of the two films of that year where Brocka collaborated with cinematographer Pedro Manding Jr. before the latter's murder; the other is Biktima.
[2] In 2010, the film was remade into a television drama series of the same name by GMA Network as the nineteenth installment of Sine Novela and starred Dennis Trillo as Levi, Jennylyn Mercado as Rachel, Al Tantay as Edmundo Guatlo, and Sandy Andolong as Rowena Guatlo.
Rachel visits her family, but her younger sister Gigi is embarrassed because of her affair with Edmundo.
Falcon and his men arrive and kill Levi in front of Rachel and Jonathan, both of whom escape.
She then calls Edmundo, who admits that he was the one who ordered the abduction of her parents to make sure that she will contact her and tell her that she still loves her.
He also threatened her that if she disobeyed him, he would ruin her face, forcing her to leave her acting career and become Edmundo's mistress.
During an event, Levi's mother stabs Rowena to avenge her son before being shot and killed.
While Edmundo gives a speech at a rally, Rachel comes and tells everyone of his role in the assassinations and exposes his and his wife's atrocities.