Grisly murders once rocked Luoma Lake. Now, decades later, Mu Dai travels to Wujiang to meet an informant with new details on the cold case.

After meeting him on the way to Wujiang, Mu Dai teams up with Cao Yanhua to trail a man looking into the Luoma Lake case and gets another lead.

While pressing Luo Ren about his interest in the case, Mu Dai discovers a shocking link between him, the Xiaoshang River incident and her boss.

As Madam Hong shares what she knows about the Luoma Lake murders, she recalls a crucial run-in and reveals her motive for investigating.

When Luo Ren's cousin gets violent, Mu Dai notices something unusual on her skin. Thirteen-Thousand tries to get time off work for him and Cao Yanhua.

After getting Pingting medical help, Mu Dai and the others battle the parasite while avoiding infection. Luo Ren's reckless decision angers Mu Dai.

Thirteen-Thousand goes with Luo Ren to his village, convinced it holds answers to the ill omen. Mu Dai applies to be a treasure hunter's bodyguard.

While Mu Dai and Hongsha recover from their injuries, the group sets up camp together. Feeling left out, Cao Yanhua wonders if he's being replaced.