I'd rather have a game where the Americans are the enemies.
I'm sure there are some of them out there, but I'd like more of them.
Maybe a story where America assassinates Kim Jong-Il for "The greater good", but then riots break out in North Korea and everything turns into chaos. A new dictator tries to use the chaos to make an attempt at uniting South and North Korea under his rule, but ultimately fails, and the complete opposite happens, with North and South uniting under South rule.
Several years later, Korea has become much better off, but the public still hold a grudge against America for essentially causing the war between North and South, as well as the chaos and riots previous to that, resulting in the deaths of hundreds of thousands Koreans. America has become much weaker since then, and Korea sees its chance at attacking.
Then you play as a Korean soldier who lost his family because of the riots after Kim Jong-Il's death, and he is eager for payback.