The deceased's best friend put on a show in front of the police.Zhang Yasong mentioned in her letter that she had experienced sexual harassment in the workplace, and that there was actually a connection between the person who harassed her and the male corpse in Xiaoshan Village.
Dai Yu discovered a detail in the autopsy report. The biological father of the deceased was also a person involved in the case. Zheng Ming therefore speculated that there was another possibility for Zhang Yasong's death.