Naruto: The Wind Calamity - Chapter 4: Progress

He, since childhood, had followed the Foreigner to practice the Defying Heaven Art, entering the most secretive special forces and becoming a fearsome assassin that made others tremble at the mere mention of his name. After a single failure, he took early retirement, but he ended up as the personal bodyguard for a rich heiress, a school beauty. Accidentally provoking some mysterious Cultivators, he gradually unveiled a hidden world of Cultivation beyond the mortal realm...

After living in a desolate land, where there wasn’t even a single blade of grass and hunger was an everyday reality, Min Sung finally returns to Earth: his home.

Three thousand avenues, is there a secret to becoming an immortal?

How can an ordinary female cultivator achieve longevity?

Please see, an ordinary woman’s path to immortality.

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- Description from novelbuddy

Ruins stretched across the landscape in the apocalypse after the nuclear war.