Re:Zero Kara Hajimeru Isekai Seikatsu - Chapter 78Arc 7, - “A Volatile Reunion”

He called me his ruin. Then he made me one.Alpha Shiloh's rejection wasn’t just a scar—it was a betrayal. He left me shattered. Broken. And I had to rebuild myself in silence.I almost forgot the way his touch once burned like salvation.Now he’s back.Not to beg forgiveness. To bargain. A deadly mission, he says. He promises freedom.But then presence ignites my wolf into a frenzy. She thrashes, desperate to claim him again. But I remember the coldness in his eyes when he exiled me. The way the pack turned their backs as I crawled into the wilderness, half-dead and wholly broken. Hate simmers hotter than desire.Yet here I am, bargaining with the devil who shattered me. Every moment we share is a lie. He doesn’t know about the shadows I’ve fed, the truth I’ve buried.Or the child.One whisper of its existence, and the pack will paint the forest with my blood.But the closer we get to completing his mission, the harder it is to hide… from him, or from the part of me that still craves him.Freedom has a price.So does vengeance.And I’m not sure which will destroy me first.

Ji Huan’s parents both died in a traffic accident.
Unexpectedly, his older sister also meets the same fate.
Yet everything starts when he says “goodbye” for the last time.

Hunting monsters? Genetic comparison?
Ji Huan flees with his older sister’s posthumous child to his hometown, Bade Town.
The three Grandpa, grandson, and nephew all live interdependent days.
However, inside the swaddling clothes is not a human baby,
But a monster…

Black egg body, white ring eyes, red mouth.
A child, ah! Doesn’t he have two eyes and a mouth! Resembling an egg, he is Ji Huan’s cute nephew!

Vermilion tiled wall, white lotus pond, convalescent courtyard.
This entirely neatly handsome and elegant young man: Ah Jin.
However, he told Ji Huan about the secrets of the monsters and discreetly taught him.
Bade Town is also slowly being covered in monsters…

Or, the record of a small countryside monster’s growth.

- Description from Novelupdates

Masterpieces such as 'The Divine Comedy', 'The Theory of Evolution', 'Encyclopaedia Britannica', 'The Theory of Relativity'...Born in the history of human civilization, possess mysterious and magical powers in another world!Original sin, biological evolution, mastery of all arts...By reading the secret tomes, one can gain a variety of powers!The only trouble for the people of the other world is that they find it difficult to understand the texts from Earth.At this time, there comes a librarian from Earth...

A Mysterious continent, with many powerful sect and countless strong one. Juvenile Zhou Heng with a mysterious black broken sword, from the original stone town out into this world of war. Ascended the throne of the world with only a sword in hand.

- Description from Novelupdates