Swedish actress Alicia Vikander, left, and German-Irish actor Michael Fassbender pose during a photocall for the film "Hope" at the 79th Cannes Film Festival in Cannes, southern France, Monday. AFP-Yonhap

Asked why he joined director Na Hong-jin's sci-fi thriller "Hope," actor Michael Fassbender had a simple answer:

"Alicia told me to do it."

The Hollywood star's joke drew laughs at a Monday press conference during the 79th Cannes Film Festival, where Fassbender, his wife Alicia Vikander and co-star Taylor Russell joined Na and the Korean cast — Hwang Jung-min, Zo In-sung and Jung Ho-yeon — at the Palais des Festivals.

When asked why three established Hollywood actors chose to play aliens, Fassbender pointed to the unpredictability of Na's direction.