Minute Mage: A Time-Traveling LitRPG - Chapter 9: Welcome to Hell. Have a Revelation.

In the endless Universe is eight primordial laws. Each of the eight laws have been fused with a supreme expert, but unbeknownst to everyone, there is a ninth law in the universe. It tears open the Primordial Chaos and is beyond reach.

Di Jiu—whose name is a homophone for ‘ninth’—is the ungifted son of a powerful Di family clan in the Ji Nation as he lacks martial roots. Unwilling to resign to his fate, he practices medicine, hoping to one day cure himself.

- Description from Novelupdates

[Only a few minutes are left before the Midnight Gate opens.]The mysterious portal called the Midnight Gate would open, and dark creatures appeared. Daemonists - a group of people who can control astral beings were assigned to protect the Midnight gate from the threat of dark creatures trying to rule the world.Shaan had always wanted to become a Daemonist in hopes to protect the world. However, the job puts his life at risk, and his grandmother (his only remaining family member) didn't want Shaan to be in danger.However, more and more Midnight gates appeared, and chaos began to occur around the world. The government mandated all young people to become Daemonists and killed all the creatures of darkness, trying to break out of Midnight's gates before the world became chaotic. Could Shaan save the world from the threat of the darkness creatures?Follow Shaan's journey in exploring his powers to become the strongest Daemonist in the world to save the world from the apocalypse.

Doomsday comes, and human beings enter the heavenly world.
Ten years later, Yang Chen, who was betrayed tragically, returned strongly with the Tianyu bug. In this life, he vowed to make the betrayal pay the price. He has a powerful bug bonus, just like an open hang. Frightened to hear…

- Description from novelbuddy