An avatar might suffice, or reincarnation, but Lord Pride had long since donned the shell of a human and descended upon the Mortal World.
At that very moment, the mysterious man was conquered by Pride, willingly becoming his disciple, taking The Book of Hell with him as he left, studying Hell while beginning the evolution of The Book of Hell.
The mysterious man was named Frank Turner, a member of the Tulip Family, Queen Sophia's most esteemed Hell Study Expert. He contributed greatly to the Royal Family's successful creation of the Hell Demon Lord Container.
These theories all stemmed from The Book of Hell, which documented the Seven Deadly Sins Melody.
At that time, Frank himself was still very weak and had to rely on the Royal Family's financial and material resources for research. Therefore, all research results were the property of the Royal Family.
Those dressed in finery are not necessarily silk farmers; this truth held everywhere.