, just when the Northern Thunder and the Hero Association were recruiting, Bofoyi was not idle, and he was studying the "Space Transformation Device" day and night.

Since the King of the Underworld only gave Bofoyi half of the blueprints, Bofoyi, who has no core technology, has been stagnant in research, and Dr. Evolution, who specializes in the field of biochemistry, is powerless to do anything about the "space converter".

Seeing that Bofoyi's research was limited and he couldn't help himself, Genos enlisted the help of his creator, Dr. Kusno.

For the sake of the future of mankind, Dr. Kusno immediately went to the laboratory of Bofoy with Genos.

"I didn't expect us to work together one day again!" As soon as Kusno saw Bofoyi, he sneered.

"Does the Doctor know Mr. Beaufauer?" Genos asked curiously.

The answer to Genos was Pofoyi: "We used to be partners!"

"Thirteen years!" Cusno sighed: "We haven't worked together for thirteen years!"

"If it weren't for the underground people this time, I'm afraid we would have to wait for thirteen years!"

"Humph!" Kusno said angrily: "If you hadn't been for the experiment, regardless of the lives of innocent people, we wouldn't have gotten to this point!"

Boffoyi said stubbornly: "You are too rigid, experiments must have sacrifices, they should be happy to contribute to the progress of science!"

Kusno sneered: "You still haven't changed, you're still so extreme!"

"You're still so stubborn!"

The two stared at each other, and neither of them let anyone.

At that time, Bofoyi and Kusno were very good partners, working on mechanical prostheses together, but unfortunately in the end the two parted ways because of different ideas.

Beauferi is the kind of person who will do whatever it takes to achieve his ends, and he can spare his life for the sake of experimental data, while Cusno is much kinder, believing that technology should bring happiness to people, not pain.

In the end, the two chose to separate and conduct their own research, but deep down they still admired their respective talents.

Genos looked at the two red-faced people who were over half a hundred years old and were still arguing, so they could only come out to play a round.

"Doctor, we're pressed for time, so let's hurry up and work on the space conversion device!"

Dr. Kusno is not an unaware person, and although he hates Bofoyi in his heart, he still works with him on the "space converter".

According to the plan of the Hero Association, they hope that Bofoyi can activate the space device normally, teleport the human hero to the underworld, and catch them off guard.

At the very least, the battlefield must be limited to the underground, and the underground people must not be allowed to enter the human world.

And space devices are the only hope for mankind.

However, the Underground King also guarded against Bofoyi, and although he gave a space transformer, he did not give a way to activate it, and even the core part of the design drawings was hidden.

With only three days to make an appointment with the King of the Underworld, Kusno had to devote himself to studying the mutilated design drawings.

"Here, there's something strange about the structure here!"

"The most critical place here is missing!"

"This place seems to be misplaced!"

Two leading scientists, Bofoy and Kusno, teamed up to quickly find the missing and wrong design drawings for the "space converter".

"The Underground King really did something on the design drawings, not only hiding the core technology, but also deliberately writing a few design mistakes!" Kusno looked down in research.

"Yes, this is obviously against normal physical logic!"

Genos looked at the two scientists caught up in the ocean of research with a smile on his face, and the two of them seemed to be back to the time when they worked together.

Three days later, Cusno and Beaufoy finally figured out how to use the space converter, but how it works remains to be studied, after all, it is a technology that surpasses humans for hundreds or thousands of years!

Everything is ready, even the Hero Association has already prepared the masters, just wait for Bofoyi to open the spatial passage, these powerful heroes can kill the underground world.

The Minister of the Hero Association, Gus, arranged some A-level heroes, and let the stand-ins operate in major cities as early as two days ago, covering people's eyes, no one knew that these heroes had already been arranged in a hidden place, just waiting for Gus's order.

And the people Banggu found also joined the people of the Hero Association, but when the people of the Sword Saint Society found out that the Association did not arrange for S-class heroes to go out this time, they immediately showed a look of displeasure.

The outspoken Nitin asked Bangpu directly.

"Where are the S-class heroes, and where is your brother?"

Bang Pu smiled bitterly: "Banggu has more important things, and other S-class heroes are also sitting in major cities in case of accidents!"

Rilun frowned and said, "Why do I feel more and more that we people are cannon fodder!"

Rilun brought the other three swordsmen and their disciples this time, and Bangpu also found masters from the other two major sects, totaling about 100 people.

These people are all masters of masters, among which the three major swordsmen are no less than masters of the atomic samurai, and their disciples have the strength of A-level heroes.

"This operation is a temptation at best!" Bang Pu hurriedly explained: "This is a decapitation operation, the purpose is to kill the underground king and destroy the holy stone, it is not good to have too many people!"

"What's more, we have space devices, and we can leave calmly in case of danger!"

As soon as everyone heard what he said, they quieted down, but who knew that he had some complaints about Banggu in his heart.

But fortunately, the North Thunder brought Saitama and joined the operation, and Bangpu Fan had an old problem a day ago, and when he saw Saitama, he wanted to accept him as a disciple, and the final result was naturally that Saitama almost made him a new person.

However, Bongpu, who had personally tried Saitama's strength, became more confident in this operation.

"Today's young people, why are they so powerful!"

Time passed in a hurry.

On the other side, Jason, one of the Underworld King, also contacted Bofoyi.

"Mr. Metal Knight, I don't know if I got what my family wanted?"

Bofoyi nodded, took out a tube of blood, and looked at Jason with a hot face.

Of course, the blood was fake, Saitama's body was harder than diamond, and Bo Foyi just wanted it, and he didn't know how to take the blood.

"Great, please give me the blood!"

In Jason's surprised gaze, Bofor put away the blood again and said lightly.

"I'm going to hand it over to the King of the Underworld myself!"

Jason asked rhetorically: "This is different from the previous agreement, I just said that the blood will be handed over to me!"

Bo Foyi said coldly: "The reward has not been given to me yet!"

"As long as you give me your blood, I'll hand it over at once!"

Boffoyi sneered and said, "I can't trust you!"

Jason was angry, but Nabo had no choice but to compromise.

It's still the same coffee shop, the same "space conversion door", and Bofoyi follows Jason to the "underworld" again.

The king of the earth was waiting for him in the same place. [.]