At this point, Mai Zhihong learned that Yang Guangyao had visited the previous night. He immediately proposed to meet with him. Unexpectedly, Dr. Zhou—who had been sitting inside, drinking tea—advised the others against letting the suspect see Yang Guangyao. Hearing this, Forensic Investigator Chen took the initiative to offer to go with his wife to assess the situation. Before leaving, he carefully clipped his pen onto his notebook.
They soon arrived at the detention center, where Dr. Zhou and Yang Guangyao entered a room to interrogate Mai Zhihong. Yang Guangyao noticed the suspect’s odd behavior and tried to coax useful clues out of him, asking if anyone had threatened him. The suspect denied any threats but remained visibly troubled. Sensing something amiss, Dr. Zhou suggested she take over. Without hesitation, she took out her notebook and gently slid it toward Mai Zhihong, encouraging him to write down whatever he wanted to express.
At this moment, Mai Zhihong insisted on using English to convey his thoughts. Becoming somewhat agitated, he glanced at a small, imagined bundle beside him. It was as if he’d heard a prompting voice—perhaps a memory or an internal guide—urging him to write for his “teacher.” Suddenly steady, he began inscribing English letters in the notebook. But as he reached the third letter, Dr. Zhou realized something alarming and tried to stop him. Even though Yang Guangyao ignored her pleas, hoping to uncover the truth, he was ultimately forced out of the room.
As they stepped out, Dr. Zhou revealed her suspicion that the suspect might be on the brink of suicide. Before they could resume their argument, inside the room Mai Zhihong violently stabbed his throat with the pen’s tip, collapsing into a pool of blood. By the time Yang Guangyao and the others rushed in to save him, it was already too late.
Forensic Investigator Chen silently observed the lifeless body, remaining expressionless amidst the crowd. During the autopsy, he stood there in a daze, memories flooding back of his youth—how he had once incited Mai Zhihong to retaliate ruthlessly against those who had wronged him. He recalled offering the man a bandage like a kind gesture, and even teaching him, by the sewer, how to use certain drugs to harm others. Once Mai Zhihong showed he was willing, Chen urged him to make sacrifices if necessary. Unbeknownst to him, his student agreed without hesitation.
Later, Yang Guangyao came to view the body again. Spotting Chen, he pressed him about the autopsy report and even brought up the scar on the killer’s body, firmly declaring that he would uncover the truth.
Subsequently, Officer Ma announced to the public that Mai Zhihong had committed suicide to evade punishment and began closing the case. Hearing this, Yang Guangyao flared up and argued with his colleagues at the station once more.
Meanwhile, attention shifted to the drug dealings involving the so-called “Blind Marker” crew. Investigators began secretly monitoring every move of Zhuang Xiaohua’s group. Although Zhang Tianming and Chen Kaiqing tried to gather evidence at a KTV, their targets, aware that there was no proof against them, grew brazen. In response, Chen Kaiqing dressed provocatively to probe information about the drug trade. When she nearly fell prey to harassment, Zhang Tianming staged a dramatic rescue, proclaiming her his girlfriend on the spot.
Afterward, Zhuang Xiaohua proceeded with plans for an art exhibition. Knowing it was no simple affair, Yang Guangyao focused on a painting related to the English letters Mai Zhihong had written. Following the clues, he discovered the existence of a certain founder named Sanders, deepening the mystery surrounding the case.