4, the murderer must be very close to Zhou Yang. Otherwise, it would be impossible for her to understand Zhou Yang's various subtle habits and living habits, such as poor mental condition, easy to doze off when driving on a high speed without adequate sleep, and so on. To what extent is the murderer intimate with Zhou Yang? She can take Zhou Yang's mobile phone at will, and she still has time to load a lullaby into his mobile phone and adjust the sequence. Then it is certain that this person Shiyou and Zhou Yang are pillow people, and they can only do this after he falls asleep. The murderer pretended to be Cheng Fei to buy insurance before Zhou Yang's death, this motive can obviously be inferred that Cheng Fei did not want to kill Zhou Yang, corresponding to the testimony of the two devils, Zhou Yang didn't say much to Cheng Fei, and he didn't let her be wronged for so many years, and he didn't let him touch her so much, and he was reluctant to use her as a target of violence if he had violent tendencies. Cheng Fei has no motive or reason to kill Zhou Yang, she may be struggling, thinking about whether to leave Zhou Yang and confess to him, but she will never want to kill him.

5, Cheng Fei didn't kill Zhou Yang, but she knew that the real murderer had this intention, and the murderer must have told Cheng Fei that he wanted to kill Zhou Yang, otherwise Cheng Fei would not have been so detailed when she stated the details of the killing, and she would not have quickly appeared afterwards to receive insurance money to cover for her. The murderer doesn't care so much, what she thinks is that my woman can only belong to me, you Zhou Yang has slept with her for so many years, let her be so painful, you have to die. The murderer was a fanatical criminal, and it was normal for him to have some distorted and unreasonable ideas.

6, after Zhou Yang died, Cheng Fei himself appeared to receive the insurance money, trying to cover up the flaws in the video signing for the real murderer, Cheng Fei wanted the police not to investigate this, and directly told everyone, I am here to receive the insurance money now, so the person who bought the insurance before must be me, if you want to check, you can check around me. She's defending the real culprit. At the same time, there is a very, very important point, the murderer signed and communicated with the insurance staff through Cheng Fei's WeChat, and also used Cheng Fei's WeChat to pay the insurance money, but Cheng Fei did not react at all afterwards. What does this mean? It shows that Cheng Fei has always known the murderer's intentions, and her relationship with the murderer is also very good, so good that the murderer can use her mobile phone to do any operation at will. Therefore, in the case of the inference of point 2, the murderer must be Cheng Fei's same-sex partner.

7, Cheng Fei doesn't want to kill Zhou Yang, the real murderer wants to kill, except that Cheng Fei is Zhou Yang's pillow person and can take Zhou Yang's mobile phone at will, who else is his pillow person and can move his mobile phone at will? The real murderer learned about Zhou Yang's living habits and other information, which was not obtained through Cheng Fei at all, she and Zhou Yang have been together for half a year, as long as they observe carefully and deliberately have an in-depth understanding, it is easy to get this information, including the important information that Zhou Yang likes to cruise at a fixed speed.

In addition, Zhou Yang has not told others about the fact that he suffers from violent tendencies, and it is impossible for him to tell others, and the real culprit can only design this whole set of plans when he knows that Zhou Yang suffers from this mental illness and knows that Zhou Yang uses music therapy. Therefore, the murderer must be the one who knows that Zhou Yang has a mental illness, and has also read his medical records in full. You can go to Cheng Fei to confirm whether she knows about this matter, Zhou Yang probably didn't tell Cheng Fei about it, if that's the case, then there is only one person who knows about it.

8. At that time, Cheng Fei and the insurance commissioner signed a video policy, and Cheng Fei's video screen appeared, and through the feedback of the technician, the murderer made a video, which was later confirmed to be a video recorded by Cheng Fei and the person's WeChat video. WeChat chat, generally not very close people, will not open a video, combined with the above points, and further confirmed that this person and Cheng Fei are absolutely very close and are her partner.

9, the murderer designed this whole set of murder plans, thoughtful thinking, clever means, but don't forget that Zhou Yang is not a nervous breakdown, he will not doze off while driving when he sleeps well. And most people dozing off while driving are seen as the cause of fatigue driving because they don't get a good rest, or drive for a long time. The murderer was ready to attack when he knew that Zhou Yang would have to go on a business trip alone the next day, so he had to ensure that he not only had to rest late the first night, but also had to do something very tiring. So as long as you check where Zhou Yang went the night before, and whether he really entertained customers so late, you can basically lock the scope of the murderer.

10, Cheng Fei was unusually angry after Zhou Yang's derailment, and wanted to cut him with a knife, when it was known that the second point Cheng Fei was gay, this became incomprehensible, Cheng Fei's love for Zhou Yang was false, there was no love, why was she so excited? If she shows affection in front of people, she shouldn't be so excited about such a thing, and she will even be a little lucky, because Cheng Fei owes Zhou Yang for many years, and now that Zhou Yang is cheating, Cheng Fei can breathe a sigh of relief to a certain extent, Zhou Yang's cheating can not only reduce her guilt, but also distract Zhou Yang's attention and not so focus on her.

But the truth is the opposite, Cheng Fei was extremely excited, annoyed, and even wanted to cut Zhou Yang, why? There is only one reason, what Zhou Yang is doing now has touched Cheng Fei's extremely important core point, she is not angry at Zhou Yang's cheating, but angry at the object of Zhou Yang's cheating, which is the object she is very unwilling to see. Family and relatives have been ruled out, so this person can only be Cheng Fei's best friend, inseparable friend, and same-sex partner. In addition, no matter who it is, Cheng Fei will not care, even if it is her best friend, and even if Cheng Fei has a sister, Zhou Yang may not react so violently when she cheats on her sister.

After all these 10 points were explained, Wu Yu naturally knew who the real murderer Feng Yan was referring to.

Xu Jiayan left all the identity information when the police recorded her confession for the first time, these are true, but she has been weakening her sense of existence, even if the police recorded her identity information, they never thought of checking the details and circumstances of this person, if the police found out that Xu Jiayan had changed her name from the beginning, and was in the same class as Cheng Fei and Zhou Yang, and she had plastic surgery, she might have solved the case a long time ago, and she would not have gone around in such a big circle.

Xu Jiayan is really bold, which stems from her confidence in her own means, and also fully satisfies her conceit.

Gu Yao back then, Xu Jiayan now, the terrible thing is that her murderous intention towards Zhou Yang has been produced in high school, so she has been playing since she graduated from high school, preparing for her future killing Zhou Yang, and the police found out that Cheng Fei could not find her in high school. She had already thought of this more than ten years ago, so as soon as she graduated, she no longer had contact with the outside world, even her aunt's family.