"Yeah." Nini responded softly, flipped her palm, and showed a red projectile, and then bounced towards the front.

Nini is very clear about Zhang Yu's ability, especially Zhang Yu's ears, which are simply unimaginable. So, since Zhang Yu heard the cough, he must have heard it.

With a "puff", the fire bead shot directly into the front, causing a bright light.

Zhang Yu, who was standing in front of Nini, looked closely and the seven-star sword in his left hand was ready to throw it out at any time. Then, the fire bead shot far away, and Zhang Yu did not see a single figure.

"Hmm? Is there no one?" Zhang Yu couldn't help but mutter in a low voice when he saw this.

Nini also said in wonder: "Octopus, no one..."

Zhang Yu was also confused. He had clearly heard the cough just now, so why was there no one?

Did you say that you heard it wrong?

It shouldn't be that the cave is very quiet, and I didn't make any footsteps when I walked. How could I misheard the sudden cough?

"Ahem..."

At this moment, Zhang Yu suddenly heard a slight cough again.

The coughing sound was right in front of it, but it was not as far away as the fire beads.

Zhang Yu whispered: "I heard a cough again."

"Where... I didn't hear it..." Nini said nervously behind Zhang Yu.

"It's not far ahead." Zhang Yu said, walking forward slowly.

The cough just now was not loud, and according to the source of the sound, it was not far away.

After walking forward for seven or eight steps, Zhang Yu stopped. The slight cough sound just now seemed to be here. Moreover, Zhang Yu could probably hear that the sound should have come from the left.

On the left is the stone wall. Zhang Yu carefully looked at the stone wall. In just a moment, a cough sounded again, "Cough cough...Cough cough...Cough cough..."

The cough sound was very light, but Zhang Yu was completely sure that the cough was indeed coming from behind the stone wall.

"There are people behind this..." Zhang Yu whispered.

"Who would someone be..." Seeing Zhang Yu say so surely, Nini became even more nervous.

"I don't know...but this person has been coughing, and it doesn't feel like he was intentional..." Zhang Yu said, continuing to look at the stone wall. He then raised his hand and began to gently tap the stone wall.

"Bang...bang..."

With just one tap, Zhang Yu could hear a slight hollow sound inside.

Hearing this voice, Zhang Yu was delighted and whispered: "There is nothing behind this... I'm looking for it now... there should be a mechanism to open the portal..."

Zhang Yu searched repeatedly, but after searching for a long time, he couldn't find any mechanism. Nini had already taken back the fire beads and illuminated nearby so that Zhang Yu could see clearly. Through the bright firelight, Zhang Yu could completely confirm that there were neat gaps on the stone wall, and that is, the gap was empty behind it.

The height of the gap can be about 1.8 meters, and the width of the gap is about one meter.

With Zhang Yu's ability, he has already discovered the secret door. It is definitely not difficult to find a mechanism. How can the mechanism here be advanced?

Unfortunately, Zhang Yu really didn't find it. No matter how he tapped or how he listened to the sound, it seemed that there was no mechanism here.

"Cough cough cough...cough cough cough..." A slight cough sounded again inside the stone wall.

The cough was still so light that Zhang Yu could hear it, but Nini couldn't.

"What's wrong..." Zhang Yu was full of doubts. After thinking for a moment, he tapped the stone wall in front of him again.

"Bang...bang...bang...bang...bang...bang...bang..."

Zhang Yu increased the force of the knocking this time. He was worried that his knocking sound would be discovered by the people inside, but now, because he could not find the mechanism, Zhang Yu was a little anxious and didn't care about this anymore.

Because the force increased, after knocking for a while, Zhang Yu discovered something wrong. The hollow sound on both sides of the stone gate was relatively loud, and the hollow sound in the middle of the stone gate was relatively smaller.

"There is no mechanism... this seems to be a forceful push..." A thought popped up in Zhang Yu's mind.

Immediately afterwards, he stood to the right side of the stone gate, pressed his arms on the door, and began to push hard.

"laugh……"

It’s true that with Zhang Yu giving his all, there was a little bit of friction under the stone gate.

However, this is already Zhang Yu's effort to make money.

"It seems that this is really the case!" Although Zhang Yu thought he could not push, a smile appeared on his face.

Nini seemed to see the clues and whispered: "Are you alone unable to push them? I'll help you?"

"No, I have a way." Zhang Yu smiled slightly, then took out two pieces of talisman paper connected from his arms.

He just threw the talisman paper and heard a "puff" sound, and a Yellow Turban Strongman appeared next to him out of thin air.

Nini had seen the Yellow Turban Strong before, but she was still surprised when she saw it. She couldn't help but say, "Why is it him again? How did he change it?"

Zhang Yu immediately smiled and said, "You have your spells, and I have my spells too."

After saying that, he pulled Nini backwards, and his heart moved. The Yellow Turban Strongman held the mace in his hand onto the stone wall, and then came to the stone gate and pushed the stone gate hard.

I have to say that the Yellow Turbans are not doing anything else at the moment, and there is no problem in doing some rough and heavy work.

Especially for such errands, only the Yellow Turbans can handle it.

"Shit...shit...shit..."

The stone gate and the ground kept making friction sounds. Zhang Yu and Nini could see clearly. The right side of the stone gate began to move forward, while the left side of the stone gate was moved outward. At this moment, Zhang Yu completely understood that the stone gate was flipped and there was indeed no mechanism. But because it was too heavy, it was much more difficult to open than the ordinary secret doors of the mechanism.

Of course, if there are many people and powerful people, or if there are a few strong men, you can still easily push the door open.

Zhang Yu was also glad that he had the Yellow Turban Strongman. Otherwise, even if he discovered this door, he and Nini would not be able to push the door open.

The Yellow Turban Strongman is so powerful that he can't be pushed away in an instant.

After about half a minute, the stone door that was standing in front of me was finally pushed to establish.

A short passage was revealed inside, and the flames emitted by the fire beads could be seen from the outside. There should be a stone chamber behind the passage.

"Ahem...Ahem...Ahem..."

At this moment, the cough sounded again just now. Zhang Yu could hear it clearly, and even Nini could hear it.

"There is indeed a cough... Is there anyone here..." Nini said worriedly.

"Will there be people in this place..." Zhang Yu was a little unbelievable, because such a heavy stone gate could not be opened by one or two people, and what kind of people could hide here.
Chapter completed!