Why Are You Crying? Because I Married Your Mom After You Broke up with Me? - Chapter 413 - : The Competition Begins

When Fang Zheng opened his eyes, he was surprised to find himself reborn in a fantasy world of magic, dragons, knights, and princesses. Not only that, but even the game system that Fang Zheng had designed before also followed him into this world. Then, his next step would be to traverse thousands of plains, gain endless strength, become a brave hero, defeat the devil, marry the princess, reach the apex in life… wait, wait, wait, before all that, why was he reborn as someone who everyone called a cultist?

Lyu Liang was an ordinary young man who was supposed to live a mortal life with his father in a small village. However, a wonderful opportunity led him into the Virtual Land where he learned about his unusual origin and started his dual cultivation journey—to be a Devilish Immortal. There were six races in this world: immortals, humans, devils, demons, ghosts, and spirits. Lyu Liang had access to any of those realms. Whether he would be a great Devilish Immortal was not up to his race, but his will. For him, it was not important to be the most powerful immortal and to be worshiped like God. He eventually chose to live a secluded life with his lover.

In the current era, people are either normal or are with ‘special abilities’. Cases related to the latter are managed by the “National Anomaly Prevention and Control and Special Species Management Office”.
Qi Zheng Emperor Sheng Lingyuan was reawakened a thousand years later after he jumped off the fiery Red Lake. Xuan Ji, a newly transferred staff to the Reparations Division of the Deviant Control Office, finds himself having to clean up the mess of a revived tyrannical monarch. The two seemed to share something from the past, but unbeknownst to them, a big conspiracy is stirring right underneath their noses that could destroy the balance of the world.

- Description from Novelupdates

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