Question: What actor is starring in Warriors of Future and is also the ambassador of Hong Kong International Film Festival from 2014-2017?
Sentence (from "Warriors of Future"): Warriors of Future (), previously known as Virtus (), is an upcoming Hong Kong science fiction action film directed by visual effects artist Ng Yuen-fai in his directorial debut and starring Louis Koo, Sean Lau and Philip Keung.
Relevant evidence: Yes