Toaru Majutsu no Index - Volume 14, Chapter 4: A Collection of Steel that Blocks out the Sky. Cruel_Troopers.

This is an alternate history. Decades after the fall of the Eastern Jin Dynasty, the world is still in chaos, although there is hope for reunification.

She, the only descendant of Chinese ancient martial arts, a stunning ghost hand genius doctor, once passed through into the Ye family waste lady.

Open your eyes again, the sky and the earth are surging! What? Born waste? Disaster star? Very good, she will soon let them see what is born waste, what is a star of misfortune.

He is the evil emperor respected by thousands of people, mysterious, noble, and unattainable.

When he met her, she avoided him like a snake, and he entangled her like a vine.

“Evil Emperor, it’s not good, Madam ran away again!”

“Chasing!”

“Evil Emperor, it’s not good, Madam is hiding!”

“Look!”

- Description from novelbuddy

Chu Xuan transmigrated to a fantasy world and became the young master of a powerful family. He was rebuked for misbehaving just because he sneezed during a banquet. As punishment, he was banished from the ancestral mansion and was relocated to a remote residence.

He did not mind the punishment at all. He just needed a spot that could allow him to be a shut-in. With the system that would allow him to grow stronger by being a shut-in, the longer he stayed indoors, the more powerful he became.

After being a shut-in for a day, he was rewarded with the Indestructible Body Technique.

After being a shut-in for a month, he was rewarded with the Immovable Mountain Technique.

After being a shut-in for a year, he was rewarded with the Yuxu Celestial Scripture and 100 years of cultivation.

After being a shut-in for 10 years, he was rewarded with the Chaotic Indestructible Body and the Bell of Chaos.

…

Chu Xuan declared, “No one can make me leave my home. I like being a shut-in!”

A campus bullying incident led Chu Feng to receive a message of Rong Yun’s suicide after ten years.

Rong Yun’s relic is a novel based on him…

At this point, he came to know that Rong Yun had always liked him.

In deep regret, Chu Feng returned back to high school.

This time, he wants to protect Rong Yun, his achievement and let him have a different life.
At first, he only wants to compensate for his mistakes, but he didn’t know when his compensation become’s true love.

- Description from Novelupdates