Actress Aditi Rao Hydari has replaced Sai Pallavi as the female lead in filmmaker Mani Ratnam???s yet-untitled Tamil romantic-drama which also stars Karthi. ???Aditi has replaced Sai Pallavi. The exact reason is still unknown but it???s believed that Pallavi had set aside her dates for another project and since this film was getting delayed, she had no other option than to exit,??? a source from the film???s unit told IANS. In the film, Karthi is tipped to be playing a pilot, who falls in love while on his trip to India.