The Pacific Forum has multiple fellowships. If you're interested in the Indo-Pacific but not the ROK specifically, I'd highly advice looking at their website.

The overall objective of this fellowship is to promote stronger US-ROK, US-DPRK, and inter-Korean relations through a variety of Pacific Forum programs. The fellowship makes a deliberate effort to encourage the study of Korean economic and security issues, focusing on raising awareness among the next generation of scholars and officials in the U.S., ROK, and worldwide about the Korean Peninsula’s vital role inregional and international affairs. Kelly Fellows will develop their knowledge of Korean Peninsula issues through participation in the Pacific Forum’s Young Leaders program, research under the guidance of Pacific Forum senior staff, and the continuing series of U.S.-ROK and broader tri-/multilateral forums. There are resident and non-resident fellowships.

Requirements for this Fellowship Are:

Open Citizenship

Have completed their undergraduate education and

Have several years of experience in Indo-Pacific security issues, or

Have completed or are completing their graduate education (master’s or doctoral)

Proficient in English (verbal and written skills)

For non-U.S. citizens, an applicant must possess or be eligible for an extended stay visa

Source and application - Here

Links