Butcher Demon - Chapter 16: The Results of Teaching.

In the midst of a mall parking lot turned battleground, Korig stands with a crowbar in his hands, blood-stained and bewildered.

Chaos reigns as the world crumbles into a nightmare of undead horrors.

Amid the panic, a digital screen materializes, thrusting Korig into a twisted game of survival.

“Main Objective: Survive the Zombie Apocalypse for an hour.”

“Bonus quest: Kill 100 zombies.”

The countdown begins, and Korig must navigate the terror around him, battling both the flesh-hungry undead and the enigmatic rules of a malevolent system.

As time slips away, Korig's past and present collide, revealing secrets that could be the key to his survival.

Will he conquer the unholy countdown, or become another victim in this relentless System Mania?

……………………………………………………………

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One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Waking up from a hangover, Wang Hao finds himself reborn in an alternate world. To his delight, he realizes that he has a system to help him in this new world. However, his system turns out to be a highly unconventional one. Instead of serving justice and winning the respect of other people, Wang Hao has to do all kinds of bad things in order to make use of the system. So, Wang Hao embarks on the journey to being cursed for good…

This was a fragmented and disorganized world, this was a place that had been forgotten.