Fork was a production tool for fishing and hunting in ancient times, and later it evolved into a weapon.
Korean culture originated in China, and the fork is the "Yin" in the theory of Yin and Yang. As a soldier, there is a chilling severity. It was originally the main weapon of ancient Korean local troops (similar to today's police) and also represented the law.
During the Ming Dynasty in China, the Japanese were not alone, and North Korea was invaded by the Japanese. The Japanese are good at using knives and forks, which is very effective in restraining sword weapons. Especially in naval battles, Korean soldiers who use steel forks have the upper hand over Japanese who use swords, so this weapon is gradually chosen by the regular army.
However, in the battle of South Korean King Sejong's conquest of Tsushima Island, the steel fork storm revealed the difference that was not conducive to close combat in mountain environment.
Generally speaking, the choice of fork as the main battle weapon by the Korean army was made after many actual battles, which was also closely related to the fact that the threat of North Korea at that time mainly came from "maritime pirates".