The producer Emma Thomas also added that casting the lead actors of the film "was really fun," "because we knew we would use fresh faces and it was exciting as we were going to bring new talents to the screen, which is part of discovering the stars of the future."

The fresh new faces include singer Harry Styles, a member of the famous boy band One Direction. Nolan regulars Tom Hardy and Cillian Murphy are also starring in the film, as well as Oscar winner Mark Rylance. Thomas said it's funny that this time they discovered along the way that "if there's anyone that can bring the audience into the story, the character and the experience of the character with only one eye, we know Tom can do it. "

"Dunkirk" is set to debut in Chinese theaters across the nation on Sept.1. The Nolan couple will join in a talk and exchange on Tuesday afternoon with Chinese filmmaker Wu Jing, whose phenomenal "Wolf Warrior 2" has grossed more than 5.1 billion yuan (US$766 million) in China.