Park Mun-su or Bak Munsu (Hangul

Hangul

Hangul,Pronounced or ; Korean: 한글 Hangeul/Han'gŭl or 조선글 Chosŏn'gŭl/Joseongeul the Korean alphabet, is the native alphabet of the Korean language. It is a separate script from Hanja, the logographic Chinese characters which are also sometimes used to write Korean...

: 박문수 , Hanja

Hanja

Hanja is the Korean name for the Chinese characters hanzi. More specifically, it refers to those Chinese characters borrowed from Chinese and incorporated into the Korean language with Korean pronunciation...

: 朴文秀) (born 1691-died 1756) was a Korean

Korea

Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

 government official in the period of King Yeongjo of Joseon

Yeongjo of Joseon

Yeongjo was the twenty-first king of the Korean Joseon Dynasty. He was the second son of Sukjong by Lady Suk-bin of the Choi clan , succeeded his older brother Gyeongjong.-Reign:...

 in the Joseon Dynasty

Joseon Dynasty

Joseon , was a Korean state founded by Taejo Yi Seong-gye that lasted for approximately five centuries. It was founded in the aftermath of the overthrow of the Goryeo at what is today the city of Kaesong. Early on, Korea was retitled and the capital was relocated to modern-day Seoul...

 in the history of Korea

History of Korea

The Korean Peninsula was inhabited from the Lower Paleolithic about 400,000-500,000 years ago. Archeological evidence indicates that the presence of modern humans in northeast Asia dates to 39,000 years ago. The earliest known Korean pottery dates to around 8000 BC, and the Neolithic period began...

.
He was famous for his lifetime spent protecting the Korean people from corrupt royal officials.
Mun-su passed the state examination in 1723 and later became a secret royal inspector

Secret royal inspector

Secret royal inspector, or Amhaeng-eosa was a temporary position unique to Joseon Dynasty, in which an undercover official directly appointed by the king was sent to local provinces to monitor government officials and look after the populace while traveling incognito...

, or Amhaengeosa (暗行御史, 암행어사). He is the most famous Amhaengeosa in Korean history, and has become something of a legendary figure, and there are many legends surrounding his achievements as an Amhaengeosa.
Two portraits of Park Mun-su have been preserved and are in good condition.