Chan-wook Park's most politically-charged film tackles the very volatile tension that exists between the North and South Koreans. This could have easily been propagandistic in nature, with this South Korean film portraying the Northerners as mere caricatures of Communistic ideals, but instead the film happily sidesteps this and portrays both the North Koreans and South Koreans as kinsmen.
In the beginning of the picture, both sides have a skewed view of one another, seeing each through the lens of their political temperament - the border between the two thus is interpreted as a wall that filters and jades each one's perspective. However, once that that wall is finally crossed, the two sides realize that no wall really exists, and they begin to see each other as human beings - The soldiers first call one another "enemies", but soon they are calling one another "brothers".
The characters are richly drawn and dynamic to reflect this - each are humans, with their own unique demeanor, and that their national identity is nothing more than a facade. While the soldiers are alone, away from their government infrastructures, both sides cling to one another in fellowship as they find themselves all the same. Only when the absent governmental element is reintroduced are the soldiers forced to revert back behind their facades, and tragedy results.
A powerfully moving and keenly intelligent analysis of the confusing political situation between the two opposing governmental systems. Despite being slightly marred by a few lapses into melodrama and overstatement, that can not take away from its piercing effectiveness.
The highest recommendation possible.