MTL - The Life of a Villain Starting From Naruto - Chapter 124 so the answer is

Lin Tian, who had reincarnated into the world of One Piece ten years ago met Garp, who was on duty to eradicate pirates, and become his student.

Three thousand years ago, gods and Buddhas disappeared all over the sky, and the inheritance of practice was broken. It was not until the ancient civilization was destroyed that spiritual energy recovered. Ten thousand races took advantage of this to invade.

Five hundred years later, the human race gradually rose up and began to fight for control of the land of China, and counterattacked all races.

Three hundred years later, Fang Yi, the Lord of the Great Dao, slaughtered all clans, destroyed all the heavens, stepped out of the myriad realms, and fought against the Dao of Heaven.

In desperation, Fang Yi sacrificed blood to eight hundred small worlds, reversed time and space, and was reborn nineteen years old.

In this life, he wants to live a more relaxed life, perfect his Dao Xin, and conquer the Dao of Heaven again.

- Description from novelbuddy

The maniac who was crazy about all kinds of fields such as military and steampunk had been reincarnated.

However, his father was King Sejong the Great?

The mania-wise king and his crazy maniac son.

Along with the ministers, and countless humans who were getting exploited.

Even today, the night of Joseon was filled with the light of overtime.

[Battle in different worlds] [Get characters from all worlds as imperial spirits]

Blue Star, the arena of the heavens is coming.

Yang Fan, who traveled through time, knew almost all the opponents, and he who cheated, everyone won.

Others used the few imperial spirits as bodyguards, but he used them to form the Ten Thousand Realms Legion.

Unohanaretsu VS Kozuki Momonosuke?

Tsk tsk tsk, Yang Fan said Momonosuke must die…

“Bad Handsome” Yuan Tiangang VS “Sword” Li Xiaoyao?

“I bet on Li Xiaoyao! Stud…”

[Acquisition: Imperial Sword Art]

“The Female General of the Empire” Estes VS “Xialan” Bo Han Commander?

Who else needs to consider betting?

Estes: “I have seen Master!”

“Dead Knight” Ning Caichen VS “Grass Python Hero” Xu Xian.

“…”

Yang Fan looked at the crowd of imperial spirits from various mythological systems around him.

He stated that his goal was to suppress the heavens.

- Description from novelbuddy