I did not get the name of the gate agent but I did write to Korean air and they forwarded my complaint to the LAX branch manager.

I was literally the first person to check in when the check in gates opened so they say that they were able to identify who made the mistake and notify her not to make the same mistake again.

The branch manager apologized.

That was pretty much it. I didn't ask for nor did I receive anything else like a travel voucher, mileage credit, etc.