Fate's Little Feral Consort - Chapter 26 Arrogant and Domineering 2

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

This is a story of a modern man returning to ancient times, returning to a real world without any extraordinaryness, and slowly rising by relying on the ability to attribute all data.

- Description from novelbuddy

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

The opening of Pandora's Box changed the world, giving rise to an age of superhumans and monsters. Yet mankind was not safe from its own hubris, and in the end, it destroyed itself. It's the end of the world, but Sonya Chernovna has been given a chance for a redo. With her memories of the world to come and her deep hatred of the society that had risen out of Pandora's Light, Sonya sets out to change the future.Even if it means being the most heinous villain that ever lived.--Chapters release on Monday-Friday with side stories sprinkled throughout.