Under the strict control of her mother, Jiang Xiaojie could only come to Binhai Park to paint during the summer. The police arranged to check the summer surveillance video of Binhai Park, the place where the crime Jiang Xiaojie mentioned to Lei Xu, and found some clues.Lei Xu, Du Ziyu, and Xu Zhangli went to the scene to recreate the scene and concluded that the suspect did not have enough time to commit the crime.At this moment, a “Linghua Middle School bullying video” was exposed on the Internet. In the video, the person bullying classmate Zhang Yunyun was actually Jiang Xiaojie.Lei Xu and Du Ziyu split into two groups: Du Ziyu took Xiao Liu to find Jiang Xiaojie's mother, Li Xiaoyan, to learn about the situation. Li Xiaoyan was only worried about her daughter's safety and was extremely impatient with “campus bullying”'s inquiries.At the same time, Lei Xu took Xu Zhangli to visit Zhang Yunyun's home. On the way, he saw Zong Youliang's ex-wife Sun Yundi and Shijie Group Chairman Zhu Jie getting into the same car. Lei Xu followed him in the car, but was thrown away by the astute Zhu Jie..Lei Xu and Xu Zhangli rushed to Zhang Yunyun's aunt's house and learned that Zhang Yunyun, who had been bullied, was also missing.For safety reasons, the Ninth Department coordinated with the public security to conduct temporary control over minor Zhang Yunyun's ID card.Lei Xu and Du Ziyu found Jiang Xiaojie's father, Jiang Linhai. Jiang Linhai was a cowardly housewife who seemed to know nothing about what happened to his rebellious daughter.The two found several depressing paintings in Jiang Xiaojie's bedroom, took photos and archived them, and left Jiang's house.