Jo Gwang-jo
Since the Middle Joseon period, about 670 secret royal inspectors went into action. Famous figures who served as secret royal inspectors include Jo Gwang-jo, Yi Hwang, Jeong Yak-yong, and writer Kim Man-jung. Yi Sibal (during Seonjo's reign), Yi Geon-chang (during Gojong's reign) and especially Park Mun-su (during Yeongjo's reign) are famous for their work as secret royal inspector. Secret royal inspectors were popular subject for fiction in both Joseon period and modern times. Many legends about Park Mun-su as the avenger for the people exploited by corrupt officials have passed down through folk tales (There are 300 such stories). The exploits of secret royal inspector were featured in popular Joseon-era novel, Chunhyangjeon. In recent years, the 1981–1983 TV series 'Secret Royal Inspector', the 2002 TV series 'Inspector Park Mun-su,' 2009 TV series 'Tamra, Island,' and several film adaptations of Chunhyangjeon have secret royal inspector as their main protagonist.