After hearing Bai Yan Zhenyu's inference, Mu Mu's police department was happy and asked, "brother Zhenyu, do you have any evidence?"

"First, when we found Mr. Zhang Tian hanging there, we quickly went to check the situation. The delay was short. He shouldn't suffocate and die so soon; second, for the character of Mr. Zhang Tian Zhengzi, the possibility of suicide is very low."

Although Bai yanzhenyu didn't give conclusive evidence, the Mumu police department still chose to believe it and asked curator muratsu and Inoue Minxing, "where were you two then?"

"I just sit in the audience and watch a movie."

"I was taking pictures in the screening hall."

After feeling his chin for a moment, the Mumu police department doubted, "so long as you two work together, it's possible to hang him."

"That's impossible because I have a full alibi."

Mitsuko Inoue took out his digital camera, opened the library interface, pointed to the latest photo and said, "I saw this film here when I was a child. This time I came here to recall the photos I happened to take at the time of the crime."

Mumu police department didn't trust each other. According to experience, he reasoned: "it's really like the picture at the time of the crime, but it may also be the picture you took after hanging him."

Mitsuko Inoue frowned and said impatiently, "if you don't believe it, you can look at the photos in front. Those are continuous pictures taken by me from the same angle. I think this should be the evidence that I've been there all the time."

"This is a digital camera. You just need to take the picture in advance and add the shadow." although the picture is indeed as well-known as well, the Mumu police department still has some doubts.

"Mumu police department, show me the digital camera."

Baiyan Zhenyu wanted to come to the digital camera. After carefully checking the pictures inside, he said: "Mumu police department, Mr. Inoue didn't lie. Look at these photos, we appeared in them. He didn't know we would come here today, so it's impossible to make these photos in advance."

"That's also..."

Mumu police department was right to think about it. He took back his camera and continued to watch the photos taken by Inoue Minxing. Then he pointed to a photo showing curator muratsu leaving his seat and asked, "Mr. curator, why did you leave halfway? If you went to the bathroom, the direction should be on the other side?"

Curator muratsu looked at the photos and replied, "ah, I went to check the air conditioning in the screening hall at that time."

"Air conditioning?" officer Mu murmured suspiciously, looking at curator muratsu.

Curator muratsu nodded and truthfully explained, "well, because the temperature of the air conditioner is much lower than usual, I'll go and see if there's a problem."

After listening to curator muratsu's reasons, Guangyan echoed: "yes, officer mu, I also felt very cold at that time, so I wanted to go to the bathroom."

Officer Mu Mu asked curator muratsu, "where is the air conditioning room? Can you show me?"

"Yes." curator muratsu led the people out of the safety door, pointed to a room at the end of the corridor and said, "right there, because my job is to adjust the air conditioning temperature, so I wonder why the temperature has become lower."

Mumu police department and Baiyan Zhenyu went into the air conditioning room for inspection. They found no other clues except that the temperature set by the air conditioning was very low and the wind was very strong.

After the two came back, Youli bailizi said impatiently, "what's the matter with the air conditioner now? The important thing is to determine whether Zhang Tian killed himself or committed suicide, isn't it?"

Officer Mu Mu didn't explain too much to his friend libaizi, who didn't understand the criminal investigation work, and directly said, "then please take me to the projection room where you were at the time of the crime."

"OK, please follow me." Guqiao Ren nodded and took the people to the projection room where he worked.

"This is the staircase leading to the projection room. Generally, guests are not allowed to enter."

On the way, guqiaoren introduced the people while leading the way. Soon, he took them to the projection room on the second floor.

"It is divided into two small rooms. The rest room is outside and the projector is inside."

Guqiao Ren took the people into the small room inside, pointed to the two machines inside and said, "these two are projectors. One is responsible for the on-site screening, and the other is responsible for rewinding the screened film to prepare for the next broadcast."

Officer Mu didn't quite understand the doorway. He asked modestly, "can't you do it with only one?"

"Yes, because rewinding takes time. If you don't, you won't catch up with the next broadcast."

After answering the question of Mumu police department, Guqiao Ren pointed to the front window of the projector and reminded, "look here."

The crowd looked in the direction of his fingers and found several sealed windows in the position facing the projector lens.

"This window is the observation window to observe whether the film is showing normally..."

Guqiaoren first introduced the function of the second window from the left, and then pointed to the first window on the left and said, "the leftmost window is the window where the projector projects images. That man hangs on this window, so the shadow will be displayed on the big screen."

After the Mumu police department came over to check, he asked, "can't this window be opened?"

"Well, because the glass is completely sealed."

Guqiaoren nodded and then recalled, "I remember when the shadow appeared, I stayed here, and Lily son made tea for me in the lounge next door."

"Yes, I can testify."

Youli bailizi was exactly what guqiaoren said, and then asked the Mumu police department, "Mr. police, our alibi evidence is sufficient. Do you still suspect that we killed Zhang Tian?"

Officer Mu felt his chin and thought for a while. Then he looked at Bai Yan Zhenyu, who was thoughtful. He said in an uncertain tone: "brother Zhenyu, I think this should be suicide..."

"If the film is divided into two sections from amela's appearance, the first half is played on the projector over there, and then the second half is played on another projector, so the first half doesn't have to worry about the cover of the body. When it goes to the second half, the body will appear. Therefore, the possibility of lifting the body in advance is not excluded."

Baiyan Zhenyu didn't know much about this relatively ancient broadcasting mode in Conan world. He had a relatively specific concept only after seeing the real object, so he thought of another possibility.