For Thousands of Years, My Weakest Brother Has Become a Demon King (1000 Years Later, Even My Weakest Follower Has Become A Demon King)

Novel Summary
This novel is also known as 1000 Years Later, Even My Weakest Follower Has Become A Demon King
After traveling through the game where he worked so hard to clear the level, Zhou Mu found that the whole world was stunned for some reason.
Why is the mainland united in its own name?
What’s going on with this religion in its own name?
What the hell are members of the royal family claiming to have their own bloodline? I wonder if this game doesn’t have this feature?
“What have you done in the thousand years I’ve been away!”
– Description from readMTL