【I watched as those people came happily, and then I caught them, killed them, dissected them, leaving behind a memento, representing another addition to my collection, it's great】

...

【I've been happy this week, but it seems like someone is watching me. Who is it? A doctor?】

【The doctor said he would start psychological intervention on me from today. Why?... I know what I've done can't be exposed. I can't let him find out.】

【Damn, he found out!】

【This doctor is annoying. He actually said I have delusions. Does he know what he's talking about? I'll make him realize how wrong he is. Starting today, I will follow him, and I will definitely kill him.】

...

【It's been half a month, and I finally found an opportunity. His birthday is in two days on April 19th, and he will drink a lot. I plan to take advantage of him being drunk...】

...

【The plan failed, his vigilance is too strong. But it doesn't matter, I can feel that he has been suspicious and his mental state is getting worse. I will have another chance.】

...

【Hahaha, I succeeded. Today, I will kill him! Wait, why isn't he dead? (A burst of random scribbles) I know! It's actually... like this (A burst of random scribbles). Then I'll change my approach, forever! Forever kill him! Either I die or he perishes!】

The diary is almost half full, with content that often jumps around, indicating that it is not written every day.

Yu Xing ignored the self-praising diary about his dissecting skills and directly found several important pages after reading the diary.

After reading the diary, a small note fell out from the last page of the diary.

【Do you know how much I hate you? When it's your birthday, so many people celebrate for you, but you won't let me kill even one. On my birthday... you won't see the day of my birthday, I bet you don't even know my birthday. Why aren't you dead yet? There are still over two hours left, and you will die forever, hahahaha】

"Oh, you hate me." Yu Xing looked at the note and a smile gradually appeared on his face. "How pitiful."

He couldn't flip through the books in the bedroom, and he didn't find any clues about numbers. The diary couldn't just be for showcasing the twisted inner world of the killer, there should be clues in the diary.

Yu Xing had already guessed the relationship between the killer and the doctor, and his gaze was fixed on the word "birthday."

"The password for the front door is a four-digit number, so the answer should be..."

He flipped through the diary again and Yu Xing lightly uttered a set of numbers:

"0324."

He put down the notebook and turned to open the bedroom door.

He walked all the way to the front door without encountering any obstacles. It was only when he entered the password on the lock and it displayed "Password correct" that the atmosphere suddenly turned cold.

The door was now able to be opened.

Yu Xing reached out his hand--

Ding--

Just as his hand touched the doorknob, a gust of wind came from behind him. Yu Xing instantly realized what it was, but he didn't move. A surgical knife, which appeared out of nowhere, pressed against his ear and stabbed into the metal door, emitting a sharp and trembling sound.

Yu Xing turned his head back and saw a blurry figure standing behind him, holding a bloody surgical knife in his hand.

He leaned against the door, smiling as he pulled the knife that had pierced three centimeters into the door out. Along with the one he took from the dissecting room earlier, he held two beautiful little knife flowers in his hands. "It's useless, my friend. You are destined to be the one who dies."

"How did you know my birthday!" The figure looked incredulous, bloodshot eyes visible in the only clear part of his body. "You couldn't possibly know!"

"You're so stupid." Yu Xing's smile faded. "I don't like talking to stupid people, it's a waste of breath. I'm leaving now."

Just then, a new piece of information suddenly appeared in his mind.

When you're just trying to make great content at bit.ly/3iBfjkV.

【Deduction Tip: You can increase the deduction evaluation by saying or writing down the deduction process in any way】

The words that were about to come out of his mouth took a turn, and Yu Xing revealed a particularly pure and sunny smile. "But I think there's plenty of time, and it's not impossible to generously tell you~"

The figure looked at the ever-changing expression of the person who had taken away his two surgical knives and the blood in his eyes became even thicker.

"Where should I start so that you can understand..." Yu Xing thought to himself: Where should I start so that the system will give the highest score?

"Let's start from the root.

"We actually share the same body.

"We are actually two personalities.①

"—You know this, and I know it too."

Yu Xing had noticed this from the details, and he was not unfamiliar with this knowledge, so his reaction was faster.

The killer didn't kill the doctor, but instead mentally defeated him. If we consider the struggle between the two personalities, it makes sense.

The illogicality of the space, the bodies that appear and disappear, the real-time updated notes, all have answers now.

This is the world imagined by the killer's personality. The bodies, dissecting rooms, and jars on the walls don't exist at all. Perhaps only this bedroom has some connection to reality.

He originally wanted to see if there were any clothes in the wardrobe that fit the doctor's style, but the system didn't give him the opportunity. Fortunately, after reading the diary, he was completely convinced.

"This so-called secret garden is not in reality, but in 'me,' or rather, in the mind of this body, an area imagined by you." Yu Xing smiled at the killer's personality. "You are not only a secondary personality that recently appeared, but also a secondary personality with a mental illness from birth. Every day, you see the real world through this window and think that you exist, thus imagining the killings and dissections over and over again."②

Yu Xing paused here. He was thirsty as soon as he came in, but unfortunately, he didn't find any water. He had to say so much now: "In general, the two personalities are not aware of each other. Coincidentally, your main personality, which is me, happens to be a psychiatrist. It took me a week to discover my own abnormality and learn that I actually have dissociative identity disorder. I wanted to actively find you and try preliminary treatment—"

"The first step is psychological intervention, to correct your distorted thinking, encourage cooperation, gradually assimilate you, and blur the conflicts between the two personalities. In the end, you will disappear."③

The killer's personality became excited upon hearing this. His black body seemed to be evaporating. "I knew you had bad intentions!"

"You didn't have good intentions either, so it's the same." Yu Xing didn't know what this doctor character originally thought, so he casually retorted.

"And today, you wanted to kill me when I was mentally exhausted, but found that you couldn't. As a result, the problems that have been lurking in your subconscious mind erupted. You realized that you are just a secondary personality, and you became even angrier. You decided to bring the main personality into the world you imagined. This is also your biggest weakness.

"This radical approach only has two outcomes. One, I have a mental breakdown and shatter or I spend three hours here and get assimilated by you. Two, you couldn't keep me and instead, I discovered the most vulnerable part of your mind. With my abilities as a doctor, it will be you who disappears immediately. Before that, no matter what you do, you can't hurt me.

"Because I am the main personality, and you are just a delusional patient."

Yu Xing smiled, and suddenly his wrist shook. The surgical knife in his right hand pierced directly through the killer's heart.

"See, I can't hurt you either, because this is your mental world."

The killer's personality touched his chest, which had been pierced but showed no trace of injury. He paced back and forth restlessly, his hoarse voice tormenting Yu Xing's eardrums. "No! I admit that I am a secondary personality, but I am not delusional! All of this... all of this! It's all my collection!"

He was probably referring to the bodies and the organs in the jars, but unfortunately, Yu Xing didn't want to discuss this with him.

"Your birthday... is even simpler. The day you were born is your birthday." Yu Xing left the remaining surgical knife in his hand and played with it. "The first diary entry was written on the day you were born, so... an elementary math problem?"

"7+1+1+15+2, 26 days. Subtract 26 days from my birthday, and it's your birthday, March 24th."

After explaining this, Yu Xing felt that he had made it clear enough. It was just a matter of reading comprehension of the contents in the diary, determining the effective days, and adding them up, very simple.

With that, the deduction evaluation should be there...

Having achieved his goal and relying on the fact that the killer's personality couldn't harm him, Yu Xing turned around and opened the door, walking leisurely into the black mist outside the door.

The black mist obscured Yu Xing's vision, making it impossible to see anything.

He walked aimlessly for a few steps and felt his eyelids getting heavy, overcome by drowsiness.

...

"Dr. Zheng... Dr. Zheng!"

A clear and gentle voice sounded in Yu Xing's ears, and the darkness in front of him gradually faded away. He once again felt the connection with his body and opened his eyes.

The first thing he saw was an arm wrapped in a white lab coat sleeve. He tried to move and realized that it was his own arm, just numb and without sensation.

"Ah..." He sat up straight, moved his arm a bit, and felt that his eyelids were heavy and his body was exhausted.

"Are you too tired? You fell asleep in the office... Everyone went to have lunch just now, and I saw you sleeping, so I didn't disturb you. But you can't skip lunch. You still have patients to attend to in the afternoon."

Standing beside him was a woman in professional attire, her hair tied up, wearing light makeup that gave her an approachable look. The pencil skirt showcased her feminine curves.

At this moment, she looked concerned and placed a freshly brewed cup of coffee on the desk.

Yu Xing opened his mouth, but before he could organize his words, a sentence blurted out of his mouth, a voice that clearly wasn't his own: "Okay, you go first. I'll eat later."

Huh?

I can't control myself anymore?

Yu Xing realized this fact and calmly accepted it after a moment of surprise.

The deduction game was almost over, and now it was the stage of explaining the follow-up or perfecting the content, right?

He watched as the woman nodded and left, sighing uncontrollably.

His gaze swept across the desk, where a business card was placed, with the following written on it:

【Amuro Lan Psychological Counseling Center Physician, National Level 2 Psychological Counselor, ACI International Psychological Counselor: Zheng Song】④

Yu Xing looked at himself as he opened the right cabinet of the desk and took out a paper document.

The document was enclosed in a transparent file bag, and he could see the first page directly.

"Zheng Song, after various tests, it is confirmed that you have dissociative identity disorder."

"The secondary personality, Xu Jian, is diagnosed with delusional disorder. Early treatment is recommended."

"..." Yu Xing wanted to see what this doctor was going to do now.

The doctor didn't say anything else, seemingly lost in thought. After about two minutes, he took out his phone and sent a message to a contact with a surname starting with N.

- Are you available to talk on the phone?

Another two minutes passed, and the other side replied: I'm available now.

So Dr. Zheng Song made a phone call.

The person on the other end picked up, and Yu Xing heard a somewhat lazy voice in his ear. "Oh, what brings you here today? Why did you suddenly think of me?"

"I have a mental issue that I want to consult with you."

"Oh? That's rare. What kind of problem do you need to ask someone like me, who had their psychological counselor qualification revoked a long time ago?"

"Ning Feng, maybe... I understand you a little now. I can't explain this matter with my own understanding. Maybe only you have some knowledge about it. Have you ever encountered... in a dream, being controlled by another consciousness, and waking up to find that the second personality has disappeared?" Zheng Song hesitated, but in the end, he asked.

Another consciousness? Is he referring to me? Yu Xing raised an eyebrow in his mind.

On the other end of the phone, a man named Ning Feng remained silent for a moment, seemingly digesting the information in this statement. Yu Xing could even feel Zheng Song's hand trembling slightly due to nervousness.

"Interesting." After a while, a sentence came out, followed by, "As you know, when this situation occurs..."

"I will resign." Zheng Song's tone was determined. He raised his hand and rubbed his temples. "There are some things I need to confirm, and I'm not suitable for work anymore. But I still want to understand the cause of this matter—"

"Fly over to see me when you have time." After receiving this response from Zheng Song, the other side seemed to chuckle lightly, speaking in a casual and relaxed tone.

The conversation ended here, and Yu Xing's mind received a new prompt.

【Deduction Tip: Personality Mask Assessment Game has ended】

【Judging】

【Judgment complete, you now have the official identity of a deductionist】

【Case truth restored 93%】

【Personality alienation degree growth: 0】

【Rating: S】

【Title obtained: Terrifying Newcomer】

【Obtained deduction points: 233 (Fast Clearance) (Understanding of the Plot) (Rating Bonus)】

【Personality mask generated】

...

【Personality Mask • Xing】

【Holder: Yu Xing】

【Basic Information: Male, height 185cm, weight 65kg, age *#€*# (error occurred)】

【Identity: Junior Deductionist (233/1000)】

【Mask Composition: Calm 18%, Madness 20%, Kindness 10%, Gentleness 10%, Indifference 10%, Evil 8%, Casual 2%, Lazy 1%, Tenacity 7%, Chaos 13%】

【Holder Description: There's really something wrong with you.】

【Personality Sacrifice: &#*|*^ (data error) (worn 1/6)】

【Personality Alienation Degree: 50% (When the personality alienation degree exceeds 20%, it will have a negative impact on the deductionist's personality. Your personality alienation degree is too high, please suppress the evil)】

【Deduction Store: Select to enter】

【Wishlist: To be entered】

【Future deduction information will be given to you in the most convenient way, including but not limited to mobile messages, social media, letters, dream communication, mirror display】

...

...

...

ps:

① I saw a comment from a reader a few days ago, their imagination was so amazing that they guessed it right, damn it Ծ‸Ծ

② Dissociative identity disorder is different from schizophrenia. Most of the symptoms that people think are related to dissociative identity disorder actually belong to schizophrenia, and dissociative identity disorder is currently not considered a mental illness.

③ This method is a real treatment for dissociative identity disorder, with main psychological therapy focusing on eliminating cognitive conflicts between personalities.

④ The national psychological counselor qualification for level 2 and level 3 was canceled in 2017. Currently, there are two types of ACI registered international psychological counselors: ACI registered international psychological counselor and ACI registered international senior psychological counselor. Interested readers can try to learn more about it.