Why? : Happy math tahun 1/ written by Kim Yoon-Soo ; cartoon by Kim Hong-Sun ; alih bahasa, Irene Christin Why? : Happy math tahun 2 / written by Park Sang-Wook ; illustrated by Park Sung-Hwan, Kim Ji-Yeon ; alih bahasa, Irene Christin Why? : Happy math tahun 5/ written by Seo, Chan-Suk ; illustrated by Kim, Hong-Sung ; alih bahasa, Linguist Translation Services Boros, no! nabung, yes! / developed by Cheon Keun-ah, text by Yoon-sun Park & ilustrated by Soo-ji KIM ; alih bahasa Diya M. Why? : happy math 5 / written, Seo Chan-Suk ; illustrated by Kim Hong-Sung ; alih bahasa, Linguist Translation Service EQ Biography Series : Abraham Lincoln/ Kim Nam-Kil ; cartooned by Kim Bok-Yong ; alih bahasa, Irene ChristinWhy? : masa revolusi dan perkembangan demokrasi / written by Grimnamu ; cartooned by Kim Hong Sun ; alih bahasa, Endah Nawang Novianti101 Fakta & Peristiwa / written by Kim Eun-Bin ; cartooned by Seo Young Soo ; alih bahasa, Endah Nawang NoviantiWhy? : happy science 4 / written, Kim Nam-Gil ; alih bahasa, Bambang Sudiyono ; editor, Irene ChristineWhy? : penciptaan dan penemuan / written by Kim Min-Jae ; cartoon by Kim Min-Jae ; alih bahasa, Iwan Wildana - KSB Translation