KAI KF-X was the model that followed which South Korean supersonic trainers and combat aircraft?
KAI KF-X The Korea Aerospace Industries KF-X/Indonesian Aerospace IF-X is a South Korean and Indonesian program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner. It is South Korea's second fighter development program following the FA-50.
Guizhou JL-9 The Guizhou JL-9, also known as the FTC-2000 Mountain Eagle ("Shanying"), is a two-seat fighter-trainer developed by the Guizhou Aviation Industry Import/Export Company (GAIEC) for the People's Liberation Army Air Force (PLAAF) and the People's Liberation Army Naval Air Force (PLANAF).