Vivek Oberoi is working hard for his role in director Apoorva Lakhia's next film Mission Istanbul. The film, as its title suggests, is set in Turkey and deals with the burning issue of international terrorism. Vivek plays a Turkish character named Rizwan. Reports have it that the actor may have to learn Turkish to lend authenticity to his character in the film. Knowing Vivek's habit of working hard on his roles, the actor is going to be game for learning Turkish.