Built-in Irony in this movie
SPOILERS
I thought that the relationship between the brothers in this movie was a literal manifestation of the absurdity of a civil war.
Specifically, I am talking about how Jin-Tae volunteers for every dangerous mission in the hopes of saving his brother, when all the while this is tearing he and his brother apart. This is evidenced by Jin-Suk's growing anger, culminating when they engage in mortal combat with each other. Of course, Jin-Tae's actions are motivated by love for his brother, but this actually makes them into enemies.
I am not articulating this as well as I would like, but did anyone else see this irony? That in a civil war, there can be no winners, as shown by Jin-Tae's bravery and self-sacrifice only serving to kill and alienate his "brother" (Jin-Suk literally, but also his fellow countrymen in a figurative sense)