The Kuznetsov NK-32 is an afterburning 3-spool low bypass turbofan jet engine which powers the Tupolev Tu-160 supersonic bomber, and was fitted to the later model Tupolev Tu-144LL supersonic transport.
 It is the largest and most powerful engine ever fitted on a combat aircraft.
 It produces 245 kN of thrust in maximum afterburner.
The Mikoyan-Gurevich MiG-25 (Russian: Микоян и Гуревич МиГ-25 ; NATO reporting name: Foxbat) is a supersonic interceptor and reconnaissance aircraft that was among the fastest military aircraft to enter service.
 It was designed by the Soviet Union's Mikoyan-Gurevich bureau, and is one of the few combat aircraft built primarily using stainless steel.
 It was the last plane designed by Mikhail Gurevich before his retirement.
The Tupolev Tu-160 "Beliy Lebed" (or White Swan, Russian: Туполев Ту-160 Белый лебедь , NATO reporting name: Blackjack) is a supersonic, variable-sweep wing heavy strategic bomber designed by the Tupolev Design Bureau in the Soviet Union.
 It is the largest and heaviest Mach 2+ supersonic aircraft ever built and second only to the comparable XB-70 Valkyrie in overall length.
 It is the largest and heaviest combat aircraft, the fastest bomber currently in use, and is the largest and heaviest variable-sweep wing airplane ever flown.
A diverterless supersonic inlet (DSI) is a type of jet engine air intake used by some modern combat aircraft to control air flow into their engines.
 It consists of a "bump" and a forward-swept inlet cowl, which work together to divert boundary layer airflow away from the aircraft's engine.
 This eliminates the need for a splitter plate, while compressing the air to slow it down from supersonic to subsonic speeds.
 The DSI can be used to replace conventional methods of controlling supersonic and boundary-layer airflow.
The KAI T-50 Golden Eagle (골든이글) is a family of South Korean supersonic advanced trainers and light combat aircraft, developed by Korea Aerospace Industries (KAI) with Lockheed Martin.
 The T-50 is South Korea's first indigenous supersonic aircraft and one of the world's few supersonic trainers.
 Development began in the late 1990s, and its maiden flight occurred in 2002.
 The aircraft entered active service with the Republic of Korea Air Force (ROKAF) in 2005.
The Cessna AT-17 Bobcat was a twin-engined advanced trainer aircraft designed and made in the United States, and used during World War II to bridge the gap between single-engined trainers and twin-engined combat aircraft.
 The AT-17 was powered by two Jacobs R-755-9 radial piston engines.
 The commercial version was the Model T-50, from which the AT-17 was developed.
A Light combat aircraft is a light multirole military aircraft most coming from advanced trainers that have been modified or designed for engaging in light combat missions, either in light strike or attack missions, reconnaissance or interdiction roles while some keeping its trainer role.
 They are also slower than their bigger counterparts capable only of subsonic speed though some are capable of reaching mach 1+.
 Although equipped with either guns or short range air-to-air missiles it is usually for self-defense purpose or anti-helicopter missions not for air defense as lightweight fighters do, though some are capable of air combat missions due to integrated or have variants capable of carrying powerful multi-mode radar systems, most LCAs don't have such due to their small limited design or are less powerful.
 However they can still be used to patrol the skies and implement border patrol or air policing.
 These aircraft are usually smaller and more lightly armed than the bigger multirole or strike aircraft such as the American F-18, F-15E Strike Eagle or Russian Mig-29.
 Most LCAs are armed with either bombs, rockets or gun pods used for COIN or CAS missions.
 Some aircraft have been developed to integrate more advanced armaments such as smart bombs and air to ground missiles and electronic targeting systems for better mission capability.
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.
NBMR-3 or NATO Basic Military Requirement 3 was a document produced by a North Atlantic Treaty Organisation (NATO) committee in the early 1960s detailing the specification of future combat aircraft designs.
 The requirement was for aircraft in two performance groups, supersonic fighter aircraft (NBMR-3a) and subsonic fighter-bomber aircraft (NBMR-3b).
 Both requirements specifically stated the need for V/STOL performance as the contemporary fear was that airfields could be overrun or disabled through Eastern Bloc hostile actions and that dispersed operating bases would be needed.
 Germany was planning replacements for the Fiat G.91, and Lockheed F-104G Starfighter using the new aircraft types.
The Curtiss-Wright AT-9 Jeep was a twin-engined advanced trainer aircraft used by the United States during World War II to bridge the gap between single-engined trainers and twin-engined combat aircraft.
 The AT-9 had a low-wing cantilever monoplane configuration, retractable landing gear and was powered by two Lycoming R-680-9 radial engines.

Question: KAI KF-X was the model that followed which South Korean supersonic trainers and combat aircraft?
Answer: KAI T-50 Golden Eagle