The person who called Xia Jinlan, before her death, Xia Jinlan received two phone calls, the first is to talk to someone about marriage, and finally said, "go to work and then talk about it," suggesting that the object of preparation for marriage is likely to be a coworker; the other is through the landline called. After receiving the call, Xia Jinlan asked if the other person was near her home, which is obviously different from the previous one. This suggests that more than one man is related to Xia Jinlan, and the murderer could be one of them.

As a doctor, it's easy to obtain muscle relaxants and anesthetics; as a colleague, he monitors Shen Yu's whereabouts at all times and makes countermeasures! As a doctor, he must have assumed that the police would do DNA biometrics as well; because he knew that Shen Haiyang was dead.The DNA test only further proved that Shen Haiyang was not the murderer, and he had to devise the only pointer to the murderer! So when he learned that the "sea boat case" reopened investigation, immediately thought of as soon as possible to let Shen Yu "cooperation" to complete the planting plan!

Many viewers realized that Xia Mu and Xia Jinyu don't get along like teacher and student. They have the same last name. The original script was supposed to be a mother-son relationship. They are single parents. The opening of the episode implies that there is a "Xia Mu Dad" in the story, for example, the cartoon Xia Mu watched was "Little Monkey Looking for Dad", and the original photo of the family was a family photo of the three of them.