The underground cave is another world.

Otherwise, why would Earth's technological weapons malfunction in underground caves?

Since it is a new world, it is only natural that there should be a new sun.

Moreover, is the sun in the cave really the sun?

Cao Ya walked through Hope City, the stronghold of humanity.

Hope City is the name of the underground stronghold in Shanghai.

Everyone calls this place Hope City, the hope of humanity, the hope of everyone!

This is a town built with countless lives lost.

Are cave-dwelling creatures willing to let humans establish a base here?

There must have been countless battles and countless deaths before Hope City was finally established.

It is over 5,000 meters long, over 4,000 meters wide, and covers an area of ​​over 20 square kilometers.

It sounds huge, but it's actually about the same size as Wuhan University in Shanghai.

There are more than 50,000 troops stationed here, and in wartime, the number of external troops can exceed 100,000.

It is hoped that military settlements have been built in front of and to the sides of the city, and that some troops have been stationed there.

Hope City's main gate faces north. If you walk straight ahead from the north gate without taking a detour, Tianmen City will be 80 kilometers away.

Human military settlements are limited to a radius of ten kilometers, and sometimes the underground human and creatures within a thirty-kilometer radius are regularly cleaned up.

Thirty kilometers away, that's the territory of Tianmen City.

Cao Ya's destination was just 30 kilometers away.

However, before setting off, Cao Ya needed to find the person in charge of Hope City—Chief Xu Mofu.

Xu Mofu, a sixth-rank peak martial artist, is the highest-ranking official in the military headquarters of the Demon City Underground Cave.

In reality, the Demon City Underground Cavern is overseen by Grandmasters of Rank 7 or above, and Xu Mofu is responsible for the daily military affairs, including the arrangement and planning of Hope City warriors.

Masters should not concern themselves with trivial matters.

"Cao Ya?" Xu Mofu was somewhat surprised to see Cao Ya. "Are you alone?"

"Um."

Cao Ya nodded slightly and said, "I'm preparing to storm Tianmen City..."

Before he could finish speaking, Xu Mofu interrupted him: "Are you crazy? Only a sixth-rank..."

Suddenly stunned, his eyes gleamed: "You've reached the seventh rank?!"

Cao Ya is a martial arts teacher at Shanghai Martial Arts University and a peak sixth-rank martial artist. Would he say something as unbelievable as storming Tianmen City if he wasn't confident?

Cao Ya smiled slightly: "Not only that. I can be considered an eighth-rank, and coincidentally, no one knows about my strength. I'll storm into the Underground Heavenly Gate City and turn it upside down!"

Xu Mofu paced back and forth, pondering, "This is a bit too risky. The City Lord of Tianmen is a ninth-grade cultivator."

Although surprised that Cao Ya had leaped into the eighth rank, and understanding of Cao Ya's plan, it was still too risky.

An eighth-rank official can never compare to a ninth-rank official.

"You should hunt down the underground warriors on the outskirts," Xu Mofu suggested.

Hope City and Tianmen City are 80 kilometers apart, which is not a short distance. Cao Ya is hiding between them, focusing on hunting down the underground warriors. An eighth-grade assassin will put great pressure on Tianmen City.

This suggestion was feasible, but Cao Ya still decided to directly storm Tianmen City.

“We have been on the defensive. Some time ago, the Tiannan Cave riots even disrupted the energy channels, causing us to completely abandon all our gains in the Tiannan Cave.”

Cao Ya solemnly said, "At this time, someone should stand up and tell the underground warriors that humans are not weak! If they wantonly attack human outposts, we will retaliate in kind! This is far more meaningful than killing a few underground warriors!"

Xu Mofu Ningzhu Cao Ya.

Cao Ya calmly responded to his gaze.

Seeing Cao Ya's determination, Xu Mofu gritted his teeth and said, "Fine, it's your decision! I need to inform the grandmasters in the city, as well as everyone else, not to go out during this time and to remain vigilant."

If Cao Ya really storms into Tianmen City, fights fiercely on all sides, and battles the city lord of Tianmen.

With such a major event occurring, riots are inevitable in the underground caves of Shanghai.

Hopefully, early preparations in the city can minimize casualties.

Before leaving, Xu Mofu said in a hoarse voice, "Be careful...come back alive."

They didn't press Cao Ya to explain why he had broken through to the eighth rank and even dared to challenge the ninth-rank Tianmen City Lord.

He knew Cao Ya well and believed that Cao Ya was not the kind of reckless person.

Cao Ya must have his reasons!

This is trust in one's comrades, even amidst inner turmoil.

When the other martial artists in the city received Xu Mofu's notification, they were all very surprised.

"Cao Ya, that teacher from Magic Martial Arts?"

"Eighth Rank? Are you kidding me? Sixth Rank directly into Eighth Rank, this is simply unbelievable!"

Everyone was in an uproar, finding it unbelievable.

Cao Ya's situation was somewhat beyond their comprehension.

Soon, schools and institutions in Shanghai, including Wuhan University, the military, and the Ministry of Education, received the intelligence transmitted from the underground caves in Shanghai.

Many people looked surprised. Cao Ya was a teacher at the Shanghai Martial Arts University and a peak sixth-grade martial artist. Many people knew him, but no one knew why Cao Ya's cultivation had advanced by leaps and bounds, and why he even dared to set his sights on the ninth grade!

The teachers at Wuhan University in Shanghai were particularly stunned when they heard the news.

"Cao Ya...you can't have made a mistake, can you?" a teacher couldn't help but ask.

Of course, everyone knows that such a major event cannot be wrong and must be verified multiple times.

Lü Fengrou, Bai Ruoxi, Li Changsheng, and others all had strange expressions.

"Cao Ya, what secret does he hold?"

Everyone knows that Cao Ya's rapid progress must be due to some major secret.

However, as long as Cao Ya is unwilling to talk, no one will force him.

Which of the world's strongest people doesn't have a few secrets?

The underground caves of Shanghai.

Cao Ya stepped out of Hope City, unaware that his actions had astonished everyone.

His decision to go to Tianmen City to fight against a ninth-grade expert was made after careful consideration.

The power of the seventh level of the Outer Realm of [Peerless], when exchanged for the power of the eighth or ninth rank in [Global Martial Arts], is equivalent to that of the seventh or ninth rank.

In addition to his own sixth-grade blood and qi, he also possessed the power of a Jonin-level ninja like Cao Ya from Naruto.

Facing the Ninth Rank Realm directly, Cao Ya was not afraid!

Furthermore, the "Invincible Vajra Divine Skill" has an extremely high defense, so even if he can't win, he is confident that he can retreat safely after causing a great disturbance.

The Lord of Tianmen City dared not pursue them too far.

The masters of Hope City are ready to support him at any time.

Even the Lord of Tianmen City is afraid.

Among humans on Earth, there exist individuals of unparalleled strength.

Corresponding to the True King of the Underground Cave.

Cao Ya proceeded openly and honestly, encountering several teams of Earth human martial artists along the way, which he easily dealt with as enemies who posed a significant challenge to them.

He told those people to go back.

"Teacher, where are you going? Doing something big? Take us with you!" Qin Fengqing asked eagerly from a small team of martial artists from Shanghai Martial Arts University.

Everyone turned to look at Cao Ya.

"I'm going to Tianmen City, do you want to come?" Cao Ya asked with a smile.

Everyone shrank back and gave an awkward smile.

Tianmen City? Forget it, they're only third-rank, going to Tianmen City would be suicide.

As they spoke, Cao Ya glanced at Qin Fengqing; this guy also had a promising future.

He's only at the third rank now, too weak.

"Teacher, you've become a Grandmaster?" Qin Fengqing asked again.

Cao Ya simply nodded, telling the students to return to Hope City. The Demon City Underground Caverns would not be peaceful for some time to come.

Watching Cao Ya's departing figure, the group of people looked on with envy.

When will they be this powerful?!

They roamed the underground caves with impunity, slaughtering the creatures within!