Mahouka Koukou no Rettousei - Chapter 15Volume 19 -

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

Oh Kang-Woo suddenly fell into Hell one day. The only things he had were his desire to live and the Authority of Predation. He devoured hundreds of thousands of demons from the First Hell all the way to the Ninth Hell, and even made the seven princes of Hell bow down to him.

“Why are you trying to go back? You already have everything that you could possibly desire here in Hell.”

“I have everything? Like what?”

There was nothing to eat or enjoy! The only things in Hell were desolate lands and hideous demons!

“I’m going back.”

He finally goes back to Earth after ten grueling millennia.

……………………………………………………………

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“Mr. Xu, are you really a Heavenly Master?”

“As genuine as they come, more real than gold!”

“I’ve heard that your reputation in the supernatural circle is really bad, even to the point where a ghost once called the police saying you were threatening him?”

“Impossible!”

“It wasn’t me!”

“Don’t talk nonsense!”

Xu Yang clenched the Thousand-Year Peachwood Sword in his hand, and said, “What’s the name of that ghost? Would you dare to let him confront me face to face?”

(PS: This book is also known as ‘This Heavenly Master is too Vicious’, ‘Scaring Ghosts Makes You Stronger’.)

After being awakened from their slumber, billions of people found themselves dispersed in various sealed crypts. Surrounded by earth, they each had only a shovel.