Episode 7 recap: Sun Hu prevents Song Yang from getting involved in solving the case, and the director of the orphanage commits suicide.
Song Yang recalls the words his grandfather told him when he was a child. His grandfather once cautioned him against pursuing three professions when he grew up: becoming an official, a police officer, or a forensic expert. His grandfather also entrusted him with an ancestral pendant. Shortly afterward, Song Yang witnessed his grandfather being assassinated by a mysterious person. The police arrived and took away his grandfather's body. Chief Sun Hu instructed young Song Yang to keep everything about him and his grandfather a secret.
Inside the orphanage, Song Yang turns the hands of a clock and opens a hidden room. He retrieves a bag of blood from the refrigerator. Just then, Sun Hu and Huang Xiaotao arrive. Sun Hu dismisses everyone else but keeps Song Yang behind. Sun Hu reproaches Song Yang for not obeying his instructions, stating that if something goes wrong, he won't be able to explain it to Song Yang's grandfather. Sun Hu advises Song Yang not to meddle in police affairs, emphasizing that he has been investigating the Jiangbei Slasher case himself.
Ignoring Sun Hu's plea, Song Yang examines some burnt scraps of paper from the destroyed underground area. From the remaining fragments, he discovers a crucial piece of information. Deciphering the burnt scraps, Song Yang reads: "Noon, Room 702, Natabin Hotel." Sun Hu realizes that the time is almost up and urgently asks Huang Xiaotao to lead the police force to the location, intending to apprehend the suspect.
Song Yang intends to accompany them, but Sun Hu stops him and says he will send him back. Sun Hu takes Song Yang to Wang Dali's Chinese detective agency. Upon seeing Wang Dali interfering, Sun Hu asks him to leave, expressing his desire to have a private conversation with Song Yang.
After Wang Dali left, Sun Hu handed a letter to Song Yang, which was left by Song Yang's grandfather. In the letter, his grandfather narrated the history of their Song family. The Song family has always been engaged in the profession of forensic experts, but their unique skills have made them the target of envy and easily manipulated by malicious individuals. The ability of forensic experts to uncover secrets and mysteries meant that anyone who pursued an official career would not meet a good end. Therefore, their ancestors left behind a family tradition of not becoming officials, not pursuing official careers, and not practicing forensic expertise.
However, Song Zhaolin, Song Yang's grandfather, saw Song Yang's sharp intuition and his early interest in studying forensic skills. He was both happy and worried. He was pleased that there would be a successor in the Song family and thus passed on his skills to Song Yang. However, he did not want Song Yang to embark on a path of endless calamities, and could only hope that Song Yang would choose his own path wisely. Sun Hu knew that Song Yang had been investigating the Jiangbei Slasher case, but Song Yang mentioned that the organization behind it held significant power in Southeast Asia, and he hadn't discovered any conclusive results.
Sun Hu informed Song Yang that he had discovered a killer with the codename "Seven," whose method of killing closely resembled the White Night case that Song Yang was investigating. It was highly likely that it was the same person. A masked man with a limp arrived at the hotel, which turned out to be the director of the orphanage. He was about to dispose of a female corpse in the bathtub with a knife when Wang Chao and his subordinates barged in. The director immediately committed suicide with the knife. Wang Chao informed Sun Hu about the director's suicide, and upon learning this, Song Yang wanted to leave. However, Sun Hu stopped Song Yang, not allowing him to take a single step away.
The White Night, who had fled back to the orphanage, revealed his whereabouts and the police rushed there upon receiving the report. Song Yang arrived at a bathroom and witnessed the White Night taking a shower because he knew that individuals with anhidrosis must shower after intense physical activity. Members of the Jiangbei Slasher group disguised themselves as police officers to capture the White Night. Song Yang did his best to stop them, and Wang Chao arrived in time to apprehend some of them. However, one person managed to snatch the pendant hanging from Song Yang's chest.
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