The Reborn Otaku's Code of Practice for the Apocalypse - Chapter 1.3

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

Synopsis is in the beginning first chapter, so you can try to read it first.Zhang Fei is an ordinary human, but he is also an Incubus, and he also a Heavenly Fox.

Original name: Prince Charming's Next Door, finished. One day, she slept with him accidentally. Two month later, she found herself pregnant, so they got married with baby. “Mr. Gu, I like the dishes of this restaurant.” Then the chef of that restaurant was hired as theirs. “Mr. Gu, I like the bags of that brand.” Then the designer of that brand was employed exclusively for her. She thought of herself as a stranger to him after marriage as she had always been, but in fact he doted on her totally beyond her imagination. He would satisfy all her demands, except letting her find a job. She kind of got anxiously bored at home, so she sneaked out to find herself a job. However, whichever company she was hired by would go bankrupt somehow or other. Finally, she got to know it had been always him who had done mischief surreptitiously. She went to question him angrily, but he gave her a job with a smirky smile. The next day when she went to take the office with delight, she found her employee ID card on the desk said ‘Name: Qin Zhi’ai, Position: Wife of Gu Yusheng’.

Demons, devils, ghosts and monsters

Plunge the mortals weak in horrors;

Arms of gods and blades of devils,

Shroud the world in untold evils.

Lu Sheng was an ordinary civil servant in the modern world. After waking from a drunken stupor one day, he found himself trapped in a dangerous world where demons, ghosts and supernatural monsters terrorize the land.

In this world, ordinary mortals live in dark fear and helplessness, without any means to fight against the supernatural.

As Lu Sheng struggles desperately for survival, he stumbles upon a game mod he had designed for a mobile phone app in his previous life. It unexpectedly becomes his special ability, which enables him to instantly level up any skill he learns, albeit at a cost.

Thus, Lu Sheng begins his journey, striving for power beyond the reach of a mortal as he treads the way of the Devil…

- Description from Novelupdates