With the end of Mongol dominance, incursions by wa-ko (coastal raiding forces of mixed nationalities) inspired the Korean administration to rebuild the Korean military; however, its efforts were undercut by a neo-Confucianism which deprecated militarism in favor of leadership by scholars and bureaucrats.
During the reign of King Yeongjo of Joseon (1694-1776), the Muyejebo was revised and supplemented with 12 additional fighting methods by Crown Prince Sado.