Lu Li and Hu Lang swaggered back to the Cloud Sea with the three Beast Kings. Hades Society sent a message to people along the way, forbidding anyone to challenge or attack the Beast Kings.
Hades Society put down a gag order as well. They allowed for nobody to speak anything about the Beast Kings and declared that violators would be punished by death.
That being said, given the scale of the matter, it was not surprising that information would be leaked. The general public was kept in the dark but the major families learned the news. The 12 Royal Families were the first to be informed. Of course, they didn't allow the news to spread further.
Therefore, all the general public knew was that three Beast Kings were chasing after a human and they stepped into the territory of the Hades Society. Later, powerful warriors of the Hades Society drove the three Beast Kings out of the Central Plains.