The series is mainly based on Norse mythology but is influenced by various other cultures. It falls into the genres of fantasy, action and adventure. This manhwa became the basis of the widely popular KoreanMMORPG, Ragnarok Online developed by Gravity Corp, which in turn was the basis for an adaptation into the anime, Ragnarok the Animation. Currently, Ragnarok is on indefinite hiatus as Lee Myung-jin is helping with the development of Ragnarok Online.