Starting With The Sefirah Castle In The Anime World - Chapter 445: Covering the Factory

After an ominous prophesy is discovered, the swordsmen of the kingdom of Ensis must band together to avoid the fate that has already been foretold.

Li Daoyuan accidentally traveled through the world of novels and became the father of the second-generation rich second-generation villain in the early stage of the novel. At this time, his useless son has already provoked the protagonist of the novel’s destiny, and will soon bring the entire family into the ditch. Li Daoyuan wants to change his destiny from the root…

- Description from novelbuddy

Kai's story begins in a cold holding cell - with no memories and nothing to live for. Just pain and rage. Broken, like the world around him. That’s when everything went black...The next thing he knew, he awoke as a mutant!Seven years earlier, in 2020, the Z Virus outbreak shattered the world. Cities fell. Beasts and monsters ravaged the streets. And from the chaos, mutants emerged - humans twisted by the virus into something more. A gift and a curse.But Kai didn’t mutate from the virus.He was made.The first and only stable artificial mutant, created by the twisted genius Dr Nyx - a man who failed to replicate him and spiralled into obsession.Tortured. Experimented on. Pushed to the edge. Kai finally escaped after his awakening, but the scars remained. And so did the power.Now free, Kai is cold, calculating, and merciless. His ability to manipulate blood - his own or others' - is terrifying. But to him, it’s just a tool. One he’ll wield without hesitation.In a ruined world ruled by the Association, mutants, and the strong, Kai has no interest in saving it. He wants answers about his past, the truth behind his mutation, and revenge on the man who tormented him.Only one thing is certain: He who bleeds last writes the story... even if it’s in crimson ink on the bones of the fallen.This is the story of the Bloodweaver!Disclaimer: This is a work of fiction. Any similarities to real events, locations, or people are purely coincidental and not intended to portray anything.

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates