Toaru Majutsu no Index: New Testament - Volume 17, Chapter 3: Or Isolation Surpasses a Group - Engage_U.F.O.

This novel is also known as Long Live the Mad Wife!

Daughter of the Feng Family, born a waste. Forced to marry a fool in an attempt to expel evil influences. When the first killer from the 21st century possessed this body, the sky and the earth surged. She was indifferent and cold-hearted but she let her guard down around him alone. She thought he was a pleasant sheep but didn’t expect him to be a gray wolf in disguise!

- Description from Novelupdates

When I became a rich young master, I had to enjoy it.

He is high above, the mysterious and terrible King of the Wild. With one glance, he can see people’s romances. He hates women to the extreme, but at his first glance of her, he dotes on her and spoils her.
She is a humble transmigrator, a miracle doctor who doesn’t care for the many handsome men around her. She only wants to become strong, to be worthy of that god-like man. But when she’s finally sure of her feelings, she finds out she’s already been married for years…
……
When wronged：
She uses strength to hit the big handsome iceberg-like man in front of her eyes. “People say that I’m not good enough for you, but it is you who is an old cow eating tender grass!”
A man seizes the main point and laughs like an evildoer. “This husband has to eat the grass to confirm if it is tender or not!” He puts out the red candle……
……
The world says：
The barbarian king has no heart and has no passion.
A pregnant woman very miserably thinks,” If he has no passion, then who is responsible for this big belly?”

- Description from Novelupdates

George Paddington, an orphan who lost his parents during the COVID-19 pandemic, was a prodigious video game blogger. One fateful day, he dies in an accident while saving a three-year-old child. However, instead of passing on, he wakes up in the Harry Potter universe—inside the body of a 15-year-old Severus Snape, right after his infamous fallout with Lily Evans.Armed with knowledge of the future and guided by Eva, an AI assistant-like system, George must navigate the complexities of the wizarding world. With humor, danger, love, and self-discovery shaping his journey, he embraces the magic, intrigue, and challenges of his new reality. Will he alter Snape’s fate or remain bound to the tragic path history has written?