[IQ online, no brainless plot] + [No system] + [God of Taoism] + [Eternal Life] + [No female protagonist] + [Old Six] + [Powerful tactics] + [Steady and cautious]

Zhang Wu travels through the world of cultivation and starts out as a jailer in the Heavenly Prison.

The end of being an official is the sky prison, the end of being a soldier is dying on the battlefield, and the end of being in the martial arts world is also a vendetta, and no one will die a good death.

If you want to survive, you have to stay safe and sound in the prison to earn money, learn skills, and accumulate trump cards.

A thousand years later...

When Zhang Wu decided to leave the Heavenly Prison, he had only a few cards in his hand.

"This time, if we have a 99% chance of success, then we'll take action. It's unrealistic to always strive for 100% certainty..."