Pet King - Chapter 1812

In the world of Norse mythology, a human boy falls in love with Waltraute, the fourth Valkyrie sister. He wishes to marry her, but Waltraute gives him an impossible challenge to deter him.

Nevertheless, the boy is determined to carry out the dangerous task and to marry Waltraute afterwards.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

Everything has to be studied to understand its meaning.

The traveler Chiba Shiroishi picked up a book called “The Will of Fire”.

When I opened it, the things on it had no nourishment, and the history of Konoha Village had no age, but the words ‘Will of Fire’ were written on every slanted page.

Shiraishi couldn’t sleep, so he took out the book “The Will of Fire” and read it carefully in the middle of the night, only to see the words in the cracks. The whole book was written with two words – pyramid selling!

Shiraishi felt hesitant and fearful for a while, and he decided that sooner or later, he must escape from this MLM brainwashing organization called Konoha!

(PS: Anime, Doujin, Naruto, Slow Heat, Not Brainless, Pseudo-Invincible)

- Description from novelbuddy