premise: Always (; lit. Only You) is a South Korean film directed by Song Il-gon. Starring So Ji-sub and Han Hyo-joo in the lead roles, it is about a romance between an ex-boxer who has closed his heart to the world and a telemarketer who remains spirited despite slowly going blind.
hypothesis: Always had 3 actors in it. 
reason: It said who was in the lead roles. It did not say those were the only people in the film. Most films have some extras or supporting roles. There is no way to know exactly how many people are in the film.... 