It is well known that the DPRK possesses a massive fleet of An-2 aircraft. However, information has not been widely disseminated, that this biplane is also in service with Seoul, partly because, that he does not appear in any of the lists of property of the South Korean troops. Information about him appears only after the crash of another plane..
The secret status of the biplane is indicated in the German edition of Flug Revue:
An-2 officially does not exist in the South Korean Air Force.
As noted, however, they are stationed at Seonmu Air Base, at 150 km south of Seoul. Their supplier and quantity are unknown.. At the same time, South Korean An-2s periodically crash: at least two aircraft were lost due to engine problems - one in 2009 year, another in 2015 year; at the beginning 2016 year, the third An-2 had to make an emergency landing on the river.
The author believes, that Seoul An-2 was needed as "sparring partners" due to the large fleet of the same type of aircraft, held by the DPRK (270-300 units). Pyongyang plans to use them to throw troops behind enemy lines, therefore, the South Korean military is forced to hone their skills in dealing with these machines.
An-2 at Seongmu Air Base
Seoul is convinced, that the ancient-looking "air tractors" of the DPRK pose a real threat. Therefore, the South Korean An-2 acts as an aggressor aircraft, with which you can realistically reproduce the combat tactics of the communist North- explained in edition.
According to the author, it is difficult for radars to detect the An-2 due to its low speed and low flight altitude:
It is difficult to fight them even with modern anti-aircraft systems..
used photos:https://www.flugrevue.de/
