Why ? environment / Heo, Soon-Bong ; alih bahasa, Irene Christin ; ilustrasi oleh Park, Jong-Kwan Why? : life science = ilmu pengetahuan alam / written by Heo Soon Bong ; cartoon by Park Jong Kwan ; alih bahasa, Irene Christine ; editing, Citra Why ? Mikroorganisme / Heo Soon-Bong ; alih bahasa, Iwan Wildana Why? : kotoran / written by Heo Soon Bong ; cartoon by Song Hoe Seok ; alih bahasa, Deni Supriadi Why : penyakit / Heo Soon-Bong Why ?: penyakit / Heo Soon-Bong ; alih bahasa, Deni SupriyadiWhy? : Traditional science = sains tradisional / written by Heo Soon-Bong ; cartooned by Song Hoe-Seok ; alih bahasa, Endah Nawang NoviantiWhy? : happy science 5 / written, Heo Soon Bong ; illustrated by Kim Kang-HoEQ Biography series - Helen Keller / written & cartooned, Park Jong - Kwan ; alih bahasa, Morin TanangWhy ? binatang / Lee, Kwang-Woong ; alih bahasa, Sutoyo Soh Daeyong ; cartooned by Park Jong Kwan ; editor, Florentina Noveni