The Republic of Korea is expected to order a full of 120 copies Boramae production of Korea Aerospace Industries version Block 1, a standard that corresponds to modern Western 4th generation machines. They will replace F-4 Phantom II and part F-5 Tiger II. Later it is possible to produce another variant of the aircraft – KF-21 Block 2, which according to authoritative plans is to be a 5th generation full machine.