Overview
The Coast Guard is a 2002 South Korean film directed by Kim Ki-duk. The film deals with military atrocities and the absurdities of borders and conflicts.
Plot
Private Kang is a South Korean marine guarding the South Korean coastline near the Korean Demilitarized Zone, overly eager to shoot a North Korean spy during his time on duty. On one dimly-lit night, a drunk local couple sneaks into the fenced-off demilitarized zone to have sex. Kang spots the man on his blurry night-vision scope, and mistaking him for a North Korean spy, kills him with his rifle and grenade.
Kang and the girlfriend of the dead civilian both have mental breakdowns.
The woman believes the members of the coastal guards are her dead lover, and engages in sexual affairs with them. She eventually becomes pregnant and is forced into a botched abortion by the unit's incompetent medics. The woman's brother, enraged, attempts to stab members of the unit but is subdued and arrested by local police.
From Wikipedia (CC BY-SA 4.0).