Invisible.

In 1996, 26 spies from the North infiltrate into South Korea. 25 of them are rooted out, but one last spy escapes. An HID secret agent, called 'Ghost' is put to catch the last one alive. The spy and the Ghost, finally encounter and engage in suffocating gunfights, ironically, with the Ghost using an AK-47 rifle manufactured in a communist country, and the North Korean spy using an M16 made by capitalists. The shouting of the Ghost emptily echoes in the forest, after missing the spy as he disappears 'like a ghost'. And the spy, in his hideout, tries killing himself using the last bullet… 20 years later, the Ghost, having become homeless, wanders about like a real ‘ghost’ in the downtown area in Seoul, still chasing the illusion of the spy from the North...