It is pretty clear that Seoul is going to end up paying more, it is just a matter of how much more are they willing to pay:

South Korea’s top negotiator in defense cost-sharing talks with the United States has said the allies have failed to produce a concrete result in this week’s negotiations as Washington’s demand for a sharp increase in Seoul’s share remains unchanged.
Jeong Eun-bo made the remarks Thursday following the fourth round of talks in Washington on Tuesday and Wednesday over how to share the cost of stationing the 28,500-strong U.S. Forces Korea under the cost-sharing accord, called the Special Measures Agreement (SMA).
“At this point, we are in a situation where we need to continue to narrow our differences. It is not that we have reached a concrete result,” Jeong told reporters at Dulles International Airport.
“It is right to say that the U.S. maintains its position,” he added.
Yonhap
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