Who told you I was an NPC?

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Yan Yunqing played an infrastructure game called “Become a Demon King Today”.
With his middle school syndrome, he gathered a group of crazy people as his subjects and built a huge empire.
Then he quit the game.
The game would send him messages from time to time:
[Your subjects are panicking because they can’t find you]
[Your subjects are rioting because the king is missing]
[Your subjects want to kill the king!!!]