The 97th floor of the Magic City Center Tower.

After Han Feng kicked the fire door open, the first door of the Demon Capital Central Research Institute was finally open to him.

However, according to the construction concept of the Great Hidden World, the Central Research Institute of the Demon City naturally cannot have only one fire door as a barrier against invasion.

Fire doors are just to prevent ordinary people who might have strayed in.

However, behind the fire door, there is not a dense research equipment, but a large vacant floor, as if it is really as the building management said, the entire 97th floor is used for emergency evacuation.

Han Feng looked at the vacant floor in front of him, and a smile appeared on his face.

The 97th floor of the Magic City Center Building, at first glance, is a reserved emergency evacuation space, in the whole area, only those reinforced concrete columns, as the load-bearing pillars to support the floor, erected in this space, there is no decoration in other places, it is the most basic cement blank house.

But Han Feng knew that this floor that was specially vacant was a huge trick.

The whole floor, in fact, has been very professionally designed, and there is a small part of the space in the entire floor, which has been professionally designed, so that this part of the space has directly 'disappeared'.

If there is no special reference, ordinary people will not be able to see the difference between the 97th floor of the entire Magic City Center Building and other floors.

But Han Feng, who had long known the mystery, walked quickly to the sixth reinforced concrete column in front of him, and then walked straight along the concrete column towards the wall on the left.

A wall that looked a little ordinary and without any features appeared in front of Han Feng.

This seemingly featureless wall is actually the key to entering the research institute of the Demon City Center.

Han Feng walked directly in front of this wall, stretched out his left arm, and knocked on the wall, and a crisp sound echoed throughout the floor.

The entire wall turned out to be hollow.

Han Feng smiled slightly at the wall, then directly raised his arm and used the Dark Moon Long Knife to slash at the wall in front of him.

"Click——!"

With a crisp sound, the concrete wall, which was mixed with steel plates, was split directly through the middle.

The space behind the original wall completely appeared in front of Han Feng's eyes.

A steel wall sealed the space in front of it.

In the middle of the steel wall, there is a gate that is also made of pure steel, and this gate is the entrance to the research institute in the center of the magic city.

Above the steel city wall with a silver-gray metallic luster, machine gun barrels protrude slightly from the city wall and point straight to the position of the steel gate.

"Automated defense system."

Han Feng looked at the barrel of the machine gun above his head and sighed slightly.

Due to these automatic defense systems, which require energy to activate, these machine guns are now just clawless tigers and are simply impossible to pose a threat to anyone.

Han Feng faced the steel gate in front of him, and he also did not have the slightest softness, and directly used the Dark Moon Long Knife to slash at the steel gate.

A burst of crimson sparks flew out from the contact point between the Darkmoon Knife and the steel gate, and the material obviously used to make the steel gate in front of him was not an ordinary steel, but a very special material, so it could block the attack of the Darkmoon Knife.

However, although the steel gate was made of special materials and blocked the attack of the Dark Moon Long Knife, a deep knife mark still appeared on the steel gate.

Even if it was a steel gate, using a special material, it still couldn't completely block the attack of the Dark Moon Long Knife, and judging from the depth of the knife marks, Han Feng only needed to swing the Dark Moon Long Knife twice to completely break through the steel gate.

"Dangdangdang——!"

With a few cracks of metal clashing, the steel gate was completely broken open by the Darkmoon Long Knife.

When Han Feng broke through the steel door and walked into the Demon Capital Central Research Institute, the look on his face was tight.

He saw very clearly that on a tool table fifteen meters in front of him, a blue metal piece was lying quietly on the tool table.

"Mechanical Core!"

He didn't expect a mechanical core to appear in front of him again.

And after Han Feng saw the mechanical core in front of him, the electronic sound in his head sounded again.

"The mechanical core has detected a mechanical core with the serial number Dfsotre-5682547, which is consistent with the serial number of this mechanical core, and the system recognizes that the authentication system is out of order, and the system is looking for a solution."

"If the system does not find a solution, the mechanical core will select the final solution and automatically contact the superior manufacturing department of the mechanical core, the Lankong Civilization Machinery Research Institute, to report the error information."

When Han Feng heard the solution of the mechanical core, his heart sank.

He didn't expect the mechanical core at all, and after sensing another mechanical core, the final solution turned out to be to automatically contact the superior manufacturing department of the mechanical core, the Lankong Civilization Machinery Research Institute, to report the wrong information.

What is the origin of this Lankong civilization, and what will happen after that, he is now completely confused.

After the electronic prompt sound of the mechanical core came out, without Han Feng feeling anything, the mechanical core had already sent out a hyperspace communication.

And when the mechanical core sent out the hyperspace communication, Han Feng also took two steps towards the tool table where the mechanical core was placed.

The mechanical core is actually an equilateral triangle with a light blue glow, which seems to be nothing special at first glance, but it is such an inconspicuous piece of metal that completely changes the fate of Han Feng.

So when Han Feng saw the mechanical core in front of him again, his heart was also filled with mixed feelings.

He tried to reach out and touch the mechanical core in front of him, but as soon as his left hand reached out, he immediately retracted.

There seemed to be a faint sense of fear in his heart.

The last time he touched the mechanical core, he had traveled to the present world, before the outbreak of the apocalyptic virus.

So he wasn't sure what would happen if he touched the core again.

Travel back in time to the world before? Or is it a re-entry into an unknown world? All this is an unknown.

Therefore, Han Feng faced the mechanical core in front of him, and he had a feeling of incomprehension in his heart.

He didn't know if he should touch the mechanical core in front of him again, and he didn't know if anything would happen after touching the mechanical core.

His hand froze directly in midair.

As time passed, Han Feng's left arm, five minutes after hovering above the mechanical core, he took a deep breath, as if he had made an important decision.

His left hand slowly reached for the mechanical core that was placed on the tool table!

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