I Guarded the Frontier for a Thousand Years, and Now You're Telling Me the Dynasty Fell?

Lin Qing transmigrates to another world and obtains the Lie Flat System.

But with demons from beyond the realms invading, enemy nations watching hungrily, and the dynasty forcing people into military service, his plans to lie flat are thwarted, and he's forced to join the army.

But unexpectedly, three years pass, then another three. One superior after another dies in battle, and by the time Lin Qing realizes it, he has become the strongest person in the dynasty.

With no other choice, he personally leads an army of 100,000 to guard the border for thousands of years and fight off the demons.

But two thousand years later, just as he thinks he can finally retire in peace, he learns that the dynasty he served was overthrown long ago. Now martial arts have declined, while technology has flourished?

Worst of all, the demons have returned, and modern humanity can't fight them?!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.