premise: Seoul Train is a 2004 documentary film that deals with the dangerous journeys of North Korean defectors fleeing through or to China. These journeys are both dangerous and daring, since if caught, they face forced repatriation, torture, and possible execution.
hypothesis: Seoul Train was filmed in 2002 to depict the dangerous journey of North Korea.
reason: The film was released in 2004, but we don't know when it was filmed.