Bak Mun-su

Bak Munsu (; 1691–1756), also known as Park Mun-su, was a Korean government official in the period of King Yeongjo of Joseon in the Joseon Dynasty. He was famous for his lifetime spent protecting the Korean people from corrupt royal officials.
Bak passed the state examination in 1723 and later became a secret royal inspector, or "amhaengeosa" (暗行御史, 암행어사). He is the most famous "amhaengeosa" in the history of Korea, and has become something of a legendary figure, and there are many legends surrounding his achievements as an "amhaengeosa".
Bak was the son of Bak Hang-han, and a member of the Goryeong Park clan. His pen name was Gieun, his courtesy name was Seongbo, and his posthumous name was Chungheon.
Two portraits of Bak Mun-su have been preserved and are in good condition.