I see a few dates in Sept that are in business (well, first and business, but its not international first) for $3000. Its on HA, which is obviously not KAL. But to be honest, considering I would (and did) pay close to $3000 for an upgradeable KAL fare, plus 80,000 miles to upgrade to prestige sleeper, I would probably pay $3000 and fly HA in business to Korea and be pretty happy about it...

I also saw a United fare the other day in August for around $3000, but can't find it again.