As Fang's solo investigation raises more suspicion about himself, Hsu receives an unusual job offer from the Sevenleaves Foundation.

Following clues from an old photo, the police track down a man named Wu Chun-lu. Later, Fang runs into Hsu at Sevenleaves.

While Hsu starts to question Lin Ming-cheng's integrity, Fang discovers more unsettling leads that point him toward someone he admires.

The investigation reveals a link between the serial killings and a past crime. Fang disregards Hsiao-meng's efforts to help solve the case.

The search for a deserted bus brings the police one step closer to the truth. Fang and Hsu grill Ming-cheng about what happened 15 years ago.

The emergence of a new suspect dramatically redirects the investigation, forcing Fang to race against the clock to locate the serial killer.

With his life at stake, Fang needs to survive a deadly encounter. Meanwhile, Hsiao-meng and Hsu must risk everything to save their loved one.

As police search for Chang Tsung-chien, Fang recalls an incident in Chiang Hsiao-meng's past and uncovers a shocking truth about the recent deaths.

Amid a probe into the death of a man thought to be an ex-con, Fang and Hsu Hai-yin follow the next link in the murder-suicide chain.

As Liu Kuang-yung's fate hangs by a thread, Fang visits a tattoo shop linked to Hsiao-meng and encounters Hsu.

Detective Chao suspects efforts to destroy evidence and exposes Fang's personal connection to the cases. Hsiao-meng leaves a clue for Fang.

On a victim's charred body, Fang yin-jen finds evidence that incriminates a construction company. The truth about Yu Cheng-hao's death comes to light.

Fang and Hsu learn about Chiang Jo-ying's tragic end. As the investigation faces an impasse, Li Ya-chun turns herself in to the police.

Hsiao-meng and Li Ya-chun makes searing confessions about their personal motivations and involvement in the suicide cult. Hsu finds a new purpose.

Fang Yi-jen inspects a fingerprint from the scene of a grisly crime and strikes a deal with investigative journalist Hsu Hai-yin.

After attending a mentor's funeral, Fang returns to the police station and finds himself embroiled in two murder cases that happened 15 years apart.