This new unit will mostly specialize in missile warning which was a function the U.S. Air Force was providing before it was shifted over to the Space Force:

USFK Commander Gen. Paul LaCamera hosted a ceremony to mark the launch of the new unit at a hangar at Osan Air Base in Pyeongtaek, 65 kilometers south of Seoul, which is home to the U.S. 7th Air Force.
Among the attendees were U.S. Ambassador to South Korea Philip Goldberg, South Korea-U.S. Combined Forces Command Deputy Commander Gen. Ahn Byung-seok and Brig. Gen. Anthony Mastalir, commander of the U.S. Space Forces Indo-Pacific.
“The activation here today of U.S. Space Forces Korea … enhances our ability to defend the homeland, and should ensure peace and security on the Korean Peninsula and in Northeast Asia,” LaCamera said during the ceremony. “Because of U.S. Space Forces Korea, the alliance is better able to execute multidomain operations in the Korean theater of operations.”
Yonhap
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