The film was in part inspired by an incident in 2000, in which a Korean mortician working for the U.S. military in Seoul reported that he was ordered to dump a large amount of formaldehyde down the drain. In addition to its environmental concerns, this caused some antagonism toward the United States. The American military stationed in South Korea is portrayed as uncaring about the effects their activities have on the locals. The chemical agent used by the American military to combat the monster in the end, named "Agent Yellow" in a thinly-veiled reference to Agent Orange, was also used to satirical effect. The director, Bong Joon-ho, commented on the issue: "It's a stretch to simplify "The Host" as an anti-American film, but there is certainly a metaphor and political commentary about the U.S."