I walked deeper into the prison, calling out to Ye Yang, "Ye Yang, Ye Yang… answer me if you hear me."

I walked through most of the prison corridor before I heard Ye Yang say, "Stop shouting, I'm here."

Su Su pressed her hand against the cell door, "Smash the door!"

I turned and kicked the door, and it swung open under the force of my blow.

The first thing I saw was Ye Yang, sitting cross-legged on the floor with his back to the door.

Ye Yang looked like he was meditating, but his face was slightly raised, as if he was carefully examining the wall in front of him.

Ye Yang knew that I had entered the cell, but he didn't move, still focusing intently on the wall in front of him.

I walked to Ye Yang's side and said, "What are you looking at?"

Ye Yang said, "Don't make a sound, I'm looking at the map on the wall!"

"Map?" I squatted down next to Ye Yang and looked up at the wall, but I didn't see anything.

When I came in, I didn't see anything on the wall, and I thought it was just the angle, but after I squatted down, I still saw a blank wall, and I realized something was wrong.

Could Ye Yang have been tricked by someone?

Just as I was about to push Ye Yang, I heard someone nearby say, "Don't touch him. That map chooses its viewers; only those it selects can see it."

I turned my head sharply and said, "What do you mean?"

The man said, "That map appears randomly in the cell every so often."

"Those who see the map can choose to leave the cell or stay inside."

"Those who stay in the cell will not be in any danger. At most, they'll just miss a chance to escape."

"Those who leave the cell will never return."

"As for whether they died somewhere in the prison or escaped along the path marked on the map, no one knows."

I turned my head and said, "How do you know?"

The man replied, "I've lived in this prison the longest. What don't I know?"

"The map will hang on the wall for three days. During these three days, the prisoners can deduce whether the map is genuine and memorize it. After three days, it's time for them to choose."

I pressed, "After three days, how do they get out? Does someone let them out?"

"The cell door will open automatically!" The man said, "Every cell door here has a cross lock, which must be opened simultaneously by four people with four keys; it won't work if even one person is missing."

"But when those cell doors open, I can guarantee there's no one outside. Not even ghosts or spirits."

"Until now, I still don't understand how those cell doors open automatically?"

"Each time, the cell door is open for one day. If the people in the cell don't leave within that day, the cell door will lock automatically."

I glanced at the door opposite and couldn't help but shudder. I immediately turned around and ran back to my original cell.

Before I could run far, I felt like I had hit an invisible wall and was forced back.

I couldn't help but gasp, "Where have we been sent?"

Su Su groped forward two or three meters in the direction I was facing and also seemed to touch an invisible wall, unable to go any further, "We... we seem to have fallen into a spatial rift. This is the real Six扇门大牢 (Six Doors Great Prison)."

Su Su was right!

I realized something was wrong only after hearing what the prisoner said!

When the man said that every door had a cross lock, I didn't pay attention, as many doors now use cross locks, and the cell I was in before used a modern cross lock.

But when the man said that opening the cell door required four keys, I realized that the "cross lock" he was talking about was not the same thing as the "cross lock" I knew.

When I looked at the opposite door, I saw a "cross"-shaped protrusion on the door, with a keyhole at each end of the cross.

That is, it takes four keys to unlock it, as the man said.

This was different from what I saw in my original cell.

When I went back and thought about the process of coming to find Ye Yang, I realized that when I first walked over, the cell doors on both sides of the corridor used normal locks.

But after I passed a corner, the locks on the doors changed to cross locks.

Doesn't this mean that the prison was divided into two parts at the corner?

At that moment, a terrifying thought appeared in my mind.

The real secret isn't hidden in the prison I was in before, but in the great prison I'm in now.

I started running back to verify my idea. I didn't expect things to be worse than I thought.

Just as I was getting anxious, I saw a large group of prison guards running towards me from the opposite direction.

Su Su and I were clearly standing in their path, but the guards acted as if they didn't see me, searching the nearby cells one by one.

The man who ran in front stopped three or four meters away from me, shone his flashlight in my direction for a long time, and then said, "There are no signs of damage on the wall. Did Li Po and the others run away?"

My heart sank: Could it be that the man can't see Su Su and me, but sees the outer wall of the prison?