A year after signing the US-Korea free exploitation agreement, US exports to Korea have gone down 10%.

In other words, this treaty failed even to provide the benefit the US was supposed to get. Of course, it did the other harm these treaties always do.

You can pretty much count on a free exploitation agreement to boost profits and reduce wages. Nowadays they also directly attack the rights of the citizens of both countries, with "investor-state" provisions that privilege foreign companies over the country's citizens.