The Black Book: Seven Deadly Sins - Chapter 4, Limits

“Born of Dragons, yet cursed by the Abyss—a king of two dooms.”----Ryuk Knull was nothing—just another powerless human in a world ruled by Titans, Vampires, and Fallen Angels. Until the Knulls came and took the only family he had left.On the brink of death, he awakened the Draconic Pets Evolution System—a power that doesn’t just tame beasts but binds them to his very soul. With it, mere monsters become apex predators.And Ryuk? He is their master.But power alone is not enough.He is a fusion of the most hated and the most divine—A being that should not exist.The abyss whispers. The dragons call. And when he rises—none will be spared.This is the Tale of the Abyssbourne Draconis!

{NO SMUT}Noa lost his virginity to the Doom God and transmigrated into a game he had played for over ten years.Instead of being the protagonist, he found himself as an extra—a mere background character, fated to die before even making an appearance.To make matters worse, the game’s main character was also an extra who had read the novel about this world.However, Noa's power came after having sex with the Doom God, her blessing granting him 1,000 lives.And armed with 10 years of gaming experience, he was set on changing his future.Though Noa had 1,000 lives to spare, dying over and over had a price…The system was cruel, issuing his existence to every corner of Velrox and slapping a sweet bounty on his head.Suddenly, everyone in the world became interested in his identity, wanting him dead.With enemies on every side, Noa not only intended to screw up the plot, but he also had to survive the impending perils, as the world was set to be destroyed in five years…

Synopsis below:How did the Avatar universe change when a transmigrant appeared in an unknown village, long before the canonical events? And how are the two islands Kyoshi Island and Uzushiogakure no Sato (A village hidden in the maelstrom)?---Tags: AU, Before-canon, Post-canon, Violence, Death of major characters, Transmigration, Harem, Children, Incest, Romantic. Foul language.

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