also published as manhwa in South Korea's Young Champ. The work was collected into 17 graphic novel volumes, which were published by Shogakukan in Japan and Daiwon C.I. in South Korea. As of 2005, these collections have sold over 2 million copies between the two countries. Translation of the comic from Korean to Japanese was provided by Manabu Okazaki. Many chapters included special author's notes to give background on Korean folktales and historical figures referenced in the story, and to explain instances in which the author chose to deviate from generally accepted fact in his portrayals. For instance, in volume 4, Youn provided information on Hwanung, a sage from the Korean legend, Dangun Shinhwa. He feared his portrayal of Hwanung as a summoned creature dressed in S&M gear might cause misunderstandings among readers of the comic, and explained that his development of the character in the comic was influenced by interesting but unsupported statements from the internet, whereas the Hwanung of legend holds a very high status in Korea, on a par with "that of Jesus Christ in Western society." Japanese editions of the comic volumes also included omake-style humorous shorts detailing a variety of Youn and Yang's cross cultural and comic writing adventures, entitled "From Korea - Hello!!" Youn and Yang maintained their residences in Incheon, South Korea throughout most of the writing and publication of the series, often requiring the services of translators for dealings with their Japanese editor, Akinobu Natsume, especially early on, and necessitating multiple business trips to Japan. Youn studied Japanese and his proficiency improved as the comic progressed. He admitted, however, that it "took two hours while staring at a dictionary" to read his first Japanese-language fan letter. Japanese editions of volume 8 of the comic were packaged with a bonus booklet entitled Osa-logy. It contained a short side story by the series authors, plus humorous comic shorts by guest authors and artists. Also included were interviews between author Youn and actress Yoon Son-ha, and between Youn and the manga authors Clamp. A guidebook entitled Amenosa, This Reality and Mission (アメンオサ、その真実と使命 Amenosa, sono shinjitsu to shimei, 공식 가이드북) was also published, containing color art galleries by artist Yang, plus story summaries and character data. A "gaiden"-style volume of two side stories was also released for sale. Since its original releases in South Korea and Japan, the comic has been licensed and published in French