Xiao Ye, while undergoing arduous training on the Nameless Island, had thoroughly figured out the situation on Heavenly Slaughter Island.
Heavenly Slaughter Island was one thousand li away from the Nameless Island where he currently was.
Twenty years ago, four Martial Artists from the Mystic Martial Realm, who had failed to ascend to the True Spirit Continent, refused to return defeated. After discovering Heavenly Slaughter Island, they claimed it as their own and became pirates, specifically targeting Martial Artists traveling to the True Spirit Continent.
At the same time, as these four were as close as brothers and to avoid conflict, they simply assumed the status of Elders. No one took the title of Island Master, and they were known collectively as the Four Evil.