(You continue exploring the office area.)

(Now it's nighttime, and the staff are all off work, leaving only the workers on the assembly line still working overtime. This provides great convenience for your exploration.)

(At the end of the office area, you find a set of stairs leading upwards.)

(You climb the stairs.)

(It's pitch-black up here, so you take out a flashlight to illuminate the surroundings.)

(Directly in front of you is a massive glass wall, behind which lies a gigantic tree trunk.)

(The tree trunk is red and white, with the white parts being bones and the red parts flesh and blood.)

(Strange patterns on the bark resemble human faces, and red blood flows upward through the crevices of the patterns.)

(The corridor beneath your feet is a winding pathway that spirals upward, built around the giant tree and extending all the way to its top.)

(You continue walking upward.)

(In the middle of the tree trunk, you see its branches, which are connected by sections of white bones. At the top of the branches is a withered fleshy palm with a grape-sized eyeball in its center.)

(As you pass by the branches, those eyeballs turn and fixate on you, staring intensely.)

(You feel your scalp tingle, and your body trembles involuntarily.)

(You concentrate, resisting the mental intrusion.)

(You keep moving upward, and the power of the mental intrusion diminishes the higher you go.)

(You see the massive treetop, and you faintly hear cries of misery.)

(To your left, a long corridor appears, leading to the treetop.)

(At the end of the corridor is another explosion-proof door.)

(You use your access card to open it.)

(Behind the door stands a group of sheep-headed creatures, and upon spotting you, they all raise the steel forks in their hands.)

(You quickly take three steps back and swiftly pull out a whip from your bag.)

(You vigorously swing the whip.)

(The whip whips up a tornado, instantly tearing the sheep-headed creatures into pieces.)

(These creatures must have been created by the giant tree using its Weird powers to protect itself from intruders, but they happen to be restrained by your whip.)

(You step over the corpses of the sheep-headed creatures and continue walking forward.)

(All the eyeballs on the tree branches are still fixated on you, and they all fly towards you, continuously banging on the glass wall.)

(You give the whip a strong shake.)

(All the eyeballs tremble, and the fleshy palm at the treetop immediately closes, covering the eyeballs.)

(You keep moving deeper into the area.)

(Through the glass window beside you, you see a group of people chasing after you at the bottom of the corridor, led by Mr. Rat.)

(You must have intruded into a restricted area, and killing the sheep-headed creatures alerted them all.)

(Swinging your arms, you quickly run forward.)

(You pass through the glass corridor and reach the end.)

(In front of you is a pitch-black tree hole, and without hesitation, you rush inside.)

(The tree hole emits the putrid smell of corpses, and with a flashlight in your mouth, you climb up the inner wall of the tree trunk towards the treetop.)

(Whispers start echoing in your ears.)

(Your vision begins to blur.)

(You take a moment to rest and resist the mental intrusion.)

(You hear a jumble of footsteps from below; Mr. Rat is getting closer to you.)

(You grit your teeth and persevere, finally reaching the top.)

(Your sister is lying on the treetop, countless branches entwined around her body, and white bone branches are delivering nutrients to her body. She looks peaceful, as if still in slumber.)

(You loudly call out your sister's name.)

(Mr. Rat enters the tree hole and curses at you.)

(Rat: Stay away from her!)

(Mr. Rat forcefully slaps the tree trunk.)

(A white bone branch sprouts from behind you; you manage to dodge in time, but it grazes your shoulder.)

(More and more bone branches come at you from all directions.)

(With all your strength, you leap and grab onto the branches on your sister's body.)

(Using both your hands and feet, you climb on the treetop.)

(Mr. Rat imitates your actions and climbs up after you.)

(Suddenly, you feel a chill behind you.)

(You look down and see Miss Cat's head popping out from under your feet.)

(Cat: Meow~ Look into my eyes, cutie. Am I beautiful?)

(Your mental world is on the verge of collapse.)

(You suddenly feel a surge of heat in your chest.)

(Grandma's lucky pouch emits a golden light.)

(Your mind clears up for a moment.)

(You: You ugly freak, go to hell!)

(You kick Miss Cat's head away, and she screams in pain before falling down.)

(Mr. Rat has climbed to the treetop, and countless rats crawl out from his sleeves and trousers.)

(You are swarmed by rats, making it difficult to move.)

(Rat: What other tricks do you have? Show me!)

(Mr. Rat breaks off a white bone branch and approaches you.)

(Rat: Die!)

(Mr. Rat raises the bone branch and thrusts it toward your chest.)

(You grit your teeth, struggle, and take out a lighter and mosquito-repellent spray from your backpack. You light the lighter and press the spray button toward the flame.)

(Boom!)

(A towering flame erupts, igniting Mr. Rat's eyebrows and hair.)

(Mr. Rat screams, trying to pat out the flames on his head. Seizing the opportunity, you headbutt him in the waist.)

(Mr. Rat slips and falls from the treetop.)

(The rats persistently bite and chase after you, and your body is covered in blood.)

(You struggle to crawl towards your sister.)

(You: Wake up quickly!)

(You shout loudly, but your sister shows no response.)

(You hear creaking sounds from behind.)

(Countless white branches bring Mr. Rat to the treetop, and Miss Cat, holding her own head, stands behind Mr. Rat.)

(Rat: Get away from her!)

(Cat: You have no idea what she is!)

(Your sister is obviously the Unspeakable.)

(Since there's no way to wake her up, you have to kill her.)

(You take out the knife and stab toward your sister's chest.)

(Your sister's body turns into an intangible like a ghost, and your knife passes through her, stabbing downward into the treetop.)

(Mr. Rat releases more rats.)

(You are pressed under the swarm of rats, and due to excessive blood loss, your vision becomes blurred.)

(You take out the spirit from your pocket, smash it with force, and then throw the lit lighter towards it.)

(The flames instantly ignite the entire treetop.)

(The swarm of rats instinctively flees.)

(You turn back and look at the cat and rat couple. They all wear terrified expressions and unhesitatingly jump off the treetop.)

(Your sister is engulfed in flames.)

(You feel the giant tree trembling, slowly collapsing.)

(Your sister sits up from the flames, giving you a sweet smile.)

(Sister: Who are you?)

(You: I am your brother.)

(Sister: No, you are not my brother.)

(Your mind collapses.)

(You gradually lose consciousness.)

(You died.)

(The deduction ends!)

Gu Yi opened his eyes, recalling the scene just now.

He had come close to the Unspeakable, even igniting the enormous tree, but ultimately, he died from mental erosion.

Clearly, this was not the correct way to pass customs.

"Did my sister say I'm not her brother? Is it because I kept thinking about killing her instead of helping her find relief? Is the right approach to restore her to normal without harming her?"