His works include A Study on the Modern Political History of Korea, The Age of Nationalism, Korean Independence Movement History, and Korean War to the Villages, and his recent theses are ‘Unified Students Strikes’ in General “Botong” Schools in 1920s Korea, which rejected and boycotted problematic teachers, Attempted Assassination of Japanese Minister Ariyoshi Akira in 1933 in Shanghai, and The Comparison of Theories of Two Japanese Journalists Resided in Joseon on the Policy to Rule Joseon.