These Demons Do it for Free - Chapter 75

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

In the wake of the apocalypse, betrayal doesn't just stab you in the back—it bites. Zorvax learned this the hard way. Abandoned by those he trusted, he didn't just become another number in the legion of the undead. No, his fate was far more peculiar.“I thought death was the end... I was wrong,” Zorvax mutters, his voice a gravelly echo of his former self. He's a zombie, but with a twist—he's got his human mind intact. Trapped in a decaying body with an insatiable hunger, Zorvax finds himself in a gruesome predicament that's just the beginning of his ordeal.Enter the 'Zombolution System,' a mysterious power he awakens that's as cryptic as it is potent. “They wanted a monster? I'll show them the true meaning of terror,”Zorvax boasts, with a smirk only a sentient zombie could muster. This dark gift is his ticket to ascend beyond a mere walking corpse, promising to unlock abilities that could crown him the emperor of the undead.As Zorvax hones his newfound skills, the line between man and monster blurs. Will his human intellect triumph, or will the beast within claim the throne? “This world has no place for the weak,” he arrogantly declares, ready to challenge fate itself.

The once greatest Saint underneath the heavens has been reborn after one hundred years. He cultivates with mighty skills, and he fights to once again reach the top of the world!

Don’t compete with me when it comes to concocting pills, 100% effectiveness means nothing to me.

Don’t compete with me when it comes to cultivation speed, I won’t be responsible when you die from embarrassment.

Don’t compete with me when it comes to experience, as I’m an ancient ancestor.

The existence of Jiang Chen is destined to ridicule thousands of geniuses……

- Description from Novelupdates

As the head disciple of the number one sect in the world, Luo Jianqing had a brilliant reputation. He was the most respected senior brother of his junior brothers and sisters: the last disciple of the cultivation world’s number one cultivator, Luo Jianqing greatly respected his master’s teachings, not crossing his limits by even half a step.

Afterwards…… he was stabbed to death just like that by the main character with his sword. His master’s sword.
Luo Jianqing: “……”
The heavens wants me dead, yet I refuse to die! See if the will of the heavens is more fearsome, or if the will of my sword is more stubborn!

Wu Yin: “Jianqing, I have something to say to you.”
Luo Jianqing: “Master, I also have something to say to you.”
Wu Yin: “… you speak first?”
Luo Jianqing: “You speak first.”
Wu Yin: “I like you.” / Luo Jianqing: “I want to top you.”
Wu Yin: “……”

- Description from Novelupdates