Who is the murderer?

Before the caller died, Xia received two phone calls. The first one is to talk about marriage, and finally he said, "Let's talk about it at work", indicating that the object of marriage is likely to be a colleague; The other one comes from the landline. After receiving the phone call, Xia asked if the other party was near her home, which was obviously different from before. This shows that more than one person is related to Xia, and the murderer may be one of them.

As a doctor, it is easy to obtain muscle relaxants and anesthetics; As a colleague, he always monitors Shen Yu's whereabouts and makes countermeasures! As a doctor, he must think that the police can also do DNA biometrics; Because he knew that Shen Haiyang was dead. DNA testing can only further prove that Shen Haiyang is not a murderer, and a unique murderer must be designed! So when he knew about the Haizhou case, he resumed the investigation and immediately thought of letting Shen Yu "cooperate" to complete the planting plan as soon as possible!

Many viewers found that Natsume and Xia Jinyu didn't get along like teachers and students. They share the same surname. The original script should be a mother-child relationship. They are single-parent families. At the beginning of the story, it was repeatedly suggested that there was a "Natsume Dad" in the story. For example, the cartoon that Natsume watched was "Little Monkey Looking for Dad", and the original photo at home was a family photo of three people.