MTL - C-class Hybrids Forced To Slay Dragons - v2 Chapter 18 fall

When Orion is mysteriously transmigrated into a primitive world where sex and other goods and services can be bartered for, he is determined to make the most of his second chance at life.

But as he delves deeper into this dangerous world filled with temptation and magic, Orion must use his wit, charm, and thirst for adventure to survive and make the most of his second chance at life.

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...

With peerless medical skills in one hand and unmatched Kung Fu in the other, bearing the memory of the Medical Divine, I dominate the city as the god it kneels to. I am here, so I decide your fate between life and death! I am here, so I am the heaven that dictates your destiny!

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy