Hero Karthi said working with director Mani Ratnam is a great learning experience as he always brings out the best performance from any actor. Karthi and actress Aditi Rao Hydari were in Hyderabad for the promotions of their latest release 'Cheliyaa.' Speaking on the occasion Karthi said, "This is an intense emotional love story and has no war sequences or related to it. I've also learned how to work hard for a role when any director comes up with some interesting character or script." 'Cheliyaa' is releasing on April 7th in Tamil and Telugu languages.