This is a past event many years ago.
The 'Three Envoys', who were once brilliant in the world, disappeared overnight.
Their fleeting deeds became a myth, causing many curious children to ask their parents: "Who are the 'Three Envoys' and why is there no news about them anymore? Is it because of that..."
"Don't mention that! The 'Three Envoys' are gods, so they have returned to heaven now. They don't have to let this world pollute their purity." The children's parents would always answer in a very stern and serious manner, as if they were convincing the ignorant children, and they seemed to be convincing themselves.