I don’t think the argument is whether South Korea is free riding but rather if their current cost sharing amount is adequate:

Former U.S. Ambassador to South Korea Mark Lippert on Friday rejected the notion that South Korea is free-riding on the United States’ troop presence in the country, saying the two nations are “very, very strong allies.”
Lippert, who served as the last U.S. ambassador to Seoul under former President Barack Obama, made the remark as negotiations on renewing a burden-sharing deal between South Korea and the U.S. got under way this week. (…………….)
n supporting his case, the former ambassador listed three factors: mandatory military service for all able-bodied South Korean men, South Korea’s shouldering of more than 90 percent of the cost of expanding Camp Humphreys, the U.S.’ largest overseas military base, and Seoul’s increase of defense spending by 4-8 percent each year.
Yonhap
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