This script is full of peculiarities.

Even Li Ang couldn't quite grasp the hidden story behind it at this stage of development.

"Judging from the construction of the tunnel and the echoes I heard when I threw the screwdriver at the ceiling earlier, the thickness of the ceiling is at least 150mm.

Logically speaking, the sound from upstairs shouldn't have been able to be transmitted so clearly like that."

Li Ang muttered to himself, "Unless the floors are specially designed to conduct sound,

and only conduct sound in one direction."

He mumbled, "Judging from their conversation,

they should be a married couple with a daughter, most likely living in a detached house in the suburbs.

The man is a researcher, possibly even an alchemist,

who has been busy with some experiment lately, and has no time to spend with his wife and daughter."

Li Ang rubbed his chin, "Could I be the sample for the experiment?

Observing how the lab rat solves the maze?

If that's the case,

it would explain why the man and woman upstairs didn't hear me shouting.

They planned everything in advance.

After observing me getting the letter, they acted out a planned charade.

That's not right, if they're already collaborators, they could just act in front of me.

Then all the information I've gathered might be false...

Unless the couple upstairs are completely unaware of the underground palace, and there's someone else who designed the palace and trapped me..."

How difficult would it be to hide the construction of a large-scale underground palace beneath the house of an alchemist?

It couldn't possibly be easier than when Li Ang secretly remodeled his house behind his landlady's back....

The more he thought, the more possibilities arose.

Li Ang shook his head, clearing his mind, "Entities must not be multiplied beyond necessity.

I should continue gathering information."

He flipped through the letter. This time, the handwriting was equally潦草 (liáo cǎo - scribbled, messy), but there were no traces of the pigpen cipher disguised as stains.

"Understandable. The same trick won't work on a saint. If the dungeon designer used a pigpen cipher again, that would be too low-level."

Li Ang put down the letter and picked up the portable kerosene lamp and matchbox placed on the floor of the room.

The kerosene lamp was made of metal and glass, red in color, wide at both ends and narrow in the middle, shaped like a gourd. It had no wick, but there was a knob on the side of the lamp head that could adjust the wick's insertion.

He casually picked up the matchbox.

The box was made of cardboard, about half the size of a palm. There were no brand labels on the outside of the box, and there was a red and black phosphorus surface on the left side.

"Ordinary red phosphorus and white phosphorus."

Li Ang sniffed the phosphorus surface, opened the matchbox, and there were two matches inside.

"So what? You give me a kerosene lamp but no wick? Are you expecting me to make a wick on the spot?"

He paused for a moment and looked down at the shredded bedsheet wrapped around his waist, "Wait, it seems I can make one myself..."

Li Ang sat cross-legged on the ground, picked up the hexagonal screwdriver, and after some effort, disassembled the kerosene lamp, inspected it,

and made a simple wick from the shredded bedsheet and cotton, stuffing it into the lamp.

"Wearing these gloves really makes everything inflexible.

I can kind of empathize with Doraemon, who can only extend his round hands."

Li Ang sighed, reassembled the kerosene lamp, and wiped his hands on the remaining strips of cloth.

After assembling the kerosene lamp, he carefully searched the room to make sure there were no hidden elements, then picked up the lamp and matches and walked out of the first door.

The outer door of Room B remained closed, and a large number of wooden chair fragments were scattered in the area between the two doors.

Li Ang picked up a fragment and glanced at it, finding that the fractured surface lacked the grain that wood should have.

All the wood was made by forcibly gluing wood chips together, molded in one piece.

"Forcibly changing the composition of matter. This should be alchemy, right? No wonder it's so strong."

Li Ang dropped the wooden piece and looked at the closed outer door of Room B, uncertainly muttering to himself, "Should I stand back..."

He stood on the circular pattern between the two doors again, and sure enough, he saw the red light light up again.

The inner door slowly closed, and after waiting a few seconds, the outer door of the room slowly opened.

To avoid being trapped again, Li Ang quickly jumped out of the door, only to find that the tunnel was pitch black, with no light visible.

"The lamp went out?"

Li Ang looked up at the dark ceiling and, relying on his memory, took out a match and struck it against the phosphorus surface of the matchbox, lighting the match and igniting the wick.

Light reappeared in the tunnel.

Li Ang shook his hand, extinguished the match, and carefully put it back into the matchbox.

Watching the outer door of Room B close automatically, he frowned and said, "The two doors can't be opened at the same time...

How come it's a bit like... a decompression chamber or a laboratory?"