Diana did not advocate arresting Liu Dahua without finding out clearly, but Mon Hansen insisted on arresting Liu Dahua for interrogation. Mon Hansen arrested Liu Dahua on suspicion of murder, and Wu Danji thought Liu Dahua had helped him kill Gao Dawei. He did not expect that the murder case referred to by Mon Hansen was Huang Ji'an. Meng Hansen arrested Liu Dahua for interrogation. He pressed against Liu Dahua every word, and even said that Liu Dahua had failed and perverted, and greatly angered Liu Dahua.
When Liu Dahua was almost irritated, he calmed down again. He said that he was in conflict with Huang Ji'an only because of money matters, but he did not kill Huang Ji'an. Mon Hansen did not believe what Liu Dahua said. Although there is no direct evidence to sue Liu Dahua, he still detained Liu Dahua for 48 hours. Diana felt that Monhansen had prejudice against Liu Dahua and did not approve of his detention of Liu Dahua, and felt that everyone on Huang Ji'an's contact list should be checked, but no one else agreed with her opinion.
Diana went to see Liu Dahua and kept claiming that she believed Liu Dahua was not the murderer, but Liu Dahua was very excited because of Diana's words. Liu Dahua has been guilty for being a survivor for a long time. He angrily yelled at Diana about his hard work and the sadness in his heart, making Diana very sad. Diana heard Liu Dahua say that in the past, she felt guilty for her inability to help Liu Dahua before, but now she is capable, so she promised Liu Dahua that she would help Liu Dahua find evidence of no murder.
Diana read Huang Ji'an's contact list many times and went to the remedial class again, asking for the list of all the students who had attended the remedial class in those years, and finally she found evidence to prove Liu Dahua's innocence. After Liu Dahua was released, Zhong Shao and Wu Danji accompanied him to take a pomelo leaf bath. Yingying also prepared a hot pot for them to celebrate together.
Mon Hansen ran into Liang Zhaoxi in the toilet. Liang Zhaoxi ridiculed Mon Hansen because Mon Hansen also arrested Liu Dahua for trial. He did not expect Mon Hansen to call him urethritis. Liang Zhaoxi was very angry after being laughed at, and happened to be heard by his subordinates, so he forced his subordinates to solve the case quickly, and by the way, signaled that his subordinates could steal information from the unsuspecting team.
When Monhansen and Diana were eating together, they heard everyone talking about the bad coffee, but they didn't recognize the coffee maker. Only Diana was particularly clear because she used to belong to the personnel department. Because of Diana's familiarity with the staff, Monhansen suddenly realized that the person who knew the identity of the trainee was probably a staff member of the treatment clinic, so they immediately launched an investigation of all the staff.
When investigating all the staff, Diana remembered that when he asked John to get the student list that day, John was very strange because he also drank while working. After learning that John was suspicious, Monhansen and Diana immediately went to see John. They did not expect that John had resigned, and they also accidentally discovered that John had worked in many units in that building.
After confirming that John was the murderer, Monhansen and Diana immediately went to the house to catch John. They did not expect Liang Zhaoxi to go a step first, but John had already run away. Diana tore off the paper on the wall before seeing John leave. She went to look in the trash can. Only then did she find that John had burned Liu Dahua's photo. She therefore determined that Liu Dahua was John's current target.
Diana called Liu Dahua, but couldn't get through, so she could only rush to the ice room to see if she could save Liu Dahua. John stared at Liu Dahua, stopped the shop in the ice room, attacked Yingying, and then attacked Liu Dahua. Yingying woke up when John started attacking Liu Dahua. She immediately burned John with a flamethrower, but she still failed to prevent John from killing Liu Dahua. Fortunately, Meng Hansen rushed to shoot John and rescued Liu Dahua.
Liu Dahua was injured and was hospitalized. Diana made a lot of delicious food and sent it to the hospital. Liu Dahua didn't want those things, but seeing Yingying coming, he immediately changed his mind. Liu Dahua accepted Diana's things, drove Diana away, and then shared with Yingying the good things Diana made.
Meng Hansen solved the case before Liang Zhaoxi. He was very proud to invite the team members to dinner, and taunted Liang Zhaoxi in front of the team members, venting the unresolved case.