Sir Orfeo as being a parallel dimension to the everyday world rather than the Land of the Dead as in the Greek myth of Orpheus and Eurydice. The ability to move between one world and the other distinguishes the tale as told in its various British versions such as "Sir Orfeo" and the Shetland ballad "King Orfeo" where the captors are envisaged as inhabitants of a parallel fairy domain rather than as the infernal region of the Dead ruled over by Hades as in the Greek myth. Katharine Briggs sees the tale as related in British folk narratives as being equally influenced
Hades (single) the gods that appear in Greek mythology. An official Instagram for the project was also created at that time. On April 10, 2016, VIXX released the opening trailer of "2016 CONCEPTION", and nine days later on April 19th released the first album in the trilogy, "Zelos" which is based upon the god of the same name. On August 1, 2016, VIXX revealed that the second album would be "Hades", which is based on the God Hades; who was the ancient Greek chthonic god of the underworld. On August 2, VIXX began releasing teasers for the album, On August 5, 2016,