P'urŭn yong kwa kang kwa ch'ak'an mulkogidŭl ŭi noraeChae-gu Kwak · First published 2019Open the Tome
Uri ka pyŏl kwa pyŏl sai rŭl yŏhaeng halttaeChae-gu Kwak, Sŏng-bae Chi · First published 2011Open the Tome