This book is one book gathered author's research paper. The author is a professor emeritus of Kookmin University, Cho Dong-gul, estimate as an authority in modern and contemporary history of Korea. He is also considered as a first generation of researchers who studied independence movement in Korea and educated followers since 1970s when special researchers of this field were unprecedented. Kim Sam-ung, former Independence hall Chief, commented on him "Great positivist and ethnic historian who received the spirit of Tanjae Sin Ch'ae-ho(丹齋申采浩)."