Career
He is known as the new positivistic research on the Economy of Joseon. He argues that the number of Comfort women and forced laborers is exaggerated in of Korea"s textbooks and challenges the Korean"s common beliefs: "Japanese colonial rule and development has been considered an absolute evil". He graduated from Department of Economics, Seoul University and earned Doctor of Economics.
He was an associate professor of Economics at Hanshin University and a professor of Sungkyunkwan University.
He is co-representative of Textbook Forum.