Text this: Haengbok ŭi sure pak'wi = Wheels of happiness / chejak, Chosŏn Yesul Yŏnghwa Ch'waryŏngso ; yŏnghwa munhak, Kim Sŏng-ok ; yŏnch'ul, Chŏng Kŏn-jo, Im Ch'ŏr-ho.