The sixth (and final) prototype of the KF-21 and the second twin seater prototype of the type. At this moment, the KF-21 dual does not seem to have its own type name, just KF-21 like the single seaters. During 2023, the KF-21 prototypes were test flown a lot. In 2024, production should start. By October 2023, the type had been ordered by South Korea and Indonesia (hence the Indonesian flag on the fuselage).