Invincible in Cultivation, Yet Forced by the System to Lie Flat

What kind of System is this? It offers no rewards, gives no quests, and even forces its Host to lie flat. After lying flat for a billion years, his cultivation surpassed even the Heavenly Dao. Yet he had no choice but to keep it hidden. With the System using both gentle persuasion and hard pressure, he could only get along with everyone as an ordinary person. It wasn't that he was easygoing, nor that he didn't want to show off. This System was just too cunning...

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.