What I will find the most interesting about the final cost sharing number that the ROK agrees to is whether or not they will exceed that number with the aid they plan to give to the Kim regime?:

Seoul and Washington will begin the first round of negotiations for the renewal of a cost-sharing agreement for American troops in Korea on Wednesday in Honolulu, Hawaii, the Ministry of Foreign Affairs said Monday.
Korea’s delegation to the three-day talks on the 10th Special Measures Agreement (SMA) will be headed by its top negotiator, Chang Won-sam, while Timothy Betts, acting deputy assistant secretary for plans, programs and operations at the U.S. State Department’s Bureau of Political-Military Affairs, will lead the U.S. side. Both delegations will include defense officials.
The SMA, a multi-year cost-sharing deal under the Status of Forces Agreement (SOFA), establishes what Korea will contribute to the non-personnel costs associated with keeping U.S. troops in the country.
Since 1991, the two countries have conducted routine negotiations to decide what Korea’s financial contribution should be, and the current five-year agreement, the ninth of its kind, is set to expire on Dec. 31. (……..)
Negotiations for the latest burden-sharing deal, set to come into force in 2019, come at a time when U.S. President Donald Trump has indicated that he may demand Korea to pay a greater contribution.
Seoul currently pays about half of the cost of the stationing of some 28,500 U.S. troops on the peninsula, and its contribution has consistently increased over the years and reached over 950 billion won ($878 million) currently compared to some 150 billion won in 1991. [Joong Ang Ilbo]
You can read more at the link, but the original Sunshine Policy was bought and paid for initially with a huge $500 million bribe to the Kim regime. Follow on bribes described as humanitarian and economic aid continued under the Sunshine Policy. The aid would total to about a $1 billion a year. To put this into context the South Koreans were paying more money to the Kim regime annually then what they were contributing to the US-ROK alliance at the time. Will history repeat itself? We will likely find out this year.