Crazy Scum: Adult Movies (2003)

Film director Wai asks gang leader Ball to invest in a movie. He cheats famous actors Lok and Sa Sa to take the classical film, and then he finds two stunt actors, April and KK, for the love scene. With the editing, he changes the film with famous actors acting erotic movie. Everything is smooth, but Ball comes up and asks for "special service" from April in exchange for his continued investment in the movie.