Yongŏ haesŏl kwa pŏmnyŏng ŭl kach'i ponŭn kŭllo, nodong kwan'gyepŏp chisik sajŏnKi-ok Yi · First published 2018Open the Tome
Puk-Chung kwan'gye taijesŭt'ŭHŭi-ok Yi, Yi, Ki-hyŏn (Researcher of political history) · First published 2015Open the Tome