After the police discovered Atsunya's body, they quickly set up a cordon area.Atsushi also had more than thirty wounds caused by kitchen knives, and fingerprints on the murder weapon provided clues to solve the case.What is striking is that before Atsushi was killed, the last person he came into contact with was Kuai'er, but Kuai'er's current whereabouts are unknown.Motomura, as a friend of Atsuya, became the first person to discover the body during the search for Atsuya.He revealed to the police that Atsushiya and Kuai'er had kidnapped young women and raped them. This crime was confirmed by the police and relevant video evidence was found.

During the investigation, Officer Mano asked whether only Kuai'er and Atsushi were involved in the case, and specifically mentioned Cheng.However, Cheng's mother said that Cheng was not at home.Meanwhile, Kuai'er chooses to burn Atsuya's photo after seeing it.During further investigation, the police discovered a video of Emo being raped and dying of an overdose of stimulants.When the police searched for Changfeng, they found that he had disappeared and took the shotgun with him.Fingerprint comparison results showed that Nagamine's fingerprints were consistent with those on the murder weapon, making Nagamine the main suspect in Atsushi's murder.Because Changfeng possessed a shotgun and might be emotionally unstable, the police decided not to reveal the identity of the real culprit to the media for the time being.However, the police are confused about how Nagamine learned about Atsaya and Kuaji's motive for raping and killing his daughter.After Acheng's father learned of the police's intention, he was thankful that he allowed Acheng to go home and taught him how to respond to police inquiries.

Officer Mano then found Kuai'er's mother, hoping that she could provide clues about Kuai'er.While Nagamine was searching for Kuai'er's whereabouts, the police received his handwritten letter, in which he admitted to killing Atsunya and expressed no regrets, while looking for another murderer.The police's promise to keep the contents of the letter confidential was broken by media reports, causing dissatisfaction with the police chief.Nagamine expressed his deep longing and anger for his daughter Emo in the letter. His determination and actions won the support of many netizens.In the process of Nagamine's escape, he recalled every moment with Ema, and finally settled in Wakako's B&B.