The Guard Post (GP 506 in South Korea) is a 2008 Korean horror film written and directed by Kong Su-chang.

Plot

Sergeant Major Seong-gyu Noh, along with a friend in the army, are paying their last respects to Noh's wife. Later, in their car, Noh's friend informs him of an assignment that the military has ordered him to do: head to Guard Post 506 in the Korean DMZ to investigate a strange incident there.