During the visit of President of the Republic of Korea Yun Suk-yeol to the KIA (Korean Aerospace Industries) establishment, the fifth prototype of the KF-21 Boramae fighter jet was introduced. This was reported by the Korean Defense Blog.

This prototype was planned to be transferred to Indonesia, but the country still has not paid its share of the KF-21 program. Therefore, the KF-21 005 will remain in South Korea for the time being. It will likely be used by the Republic of Korea Air Force for its own flight tests. However, Indonesia will be eligible to receive KF-21 005 when the program share is paid in full.

KF-X is a joint project of the Republic of Korea and Indonesia, with 80% and 20% participation respectively. The cost of the program was announced at the level of 5.2 billion dollars. This is a two-engine supersonic aircraft with a length of 13, a height of 4.5 and a wingspan of 14 meters.

It is planned to build 40 aircraft by 2028 and 120 by 2032. 6 prototypes will be produced before going into mass production. The composition of the Republic of Korea in ingredients is about 65%. Indonesia recalled its engineers in 2020 due to COVID, but at the time there was speculation that Jakarta was trying to end the joint project and buy another fighter jet.

In August 2021, about 32 Indonesian engineers began going through administrative procedures to return to Korea Aerospace Industries. Starting with these 32 engineers, around 100 employees were supposed to return to the South Korean plant by the end of last year, after Indonesia reaffirmed its commitment to the project. It will be remembered that in July the first prototype of the South Korean supersonic fighter made its first test flight. Source