A serious murder took place in Tang Dynasty’s capital city Chang'an. Ambassador of the Salo Kingdom was killed in a brothel. The case is investigated by Detective Dee and Hong Yun, but they are ambushed by the culprits, and Hong Yun's best friend is killed by a man named Tian Sha, who takes away the chrysalis of the evil Moth of Nirvana as a tribute. As a result of his unfavorable handling of the case, Dee was dismissed by Empress Wu Zetian and investigated. As a result, Yuan Feng, the commander of the Jingo Guard, summoned Di Renjie to the capital to investigate the case.
| Actor | Role |
|---|---|
 Gao ZifengNot listed | Not listed |
 Zhao JiaxuanNot listed | Not listed |
| LLi ZhengyangNot listed | Not listed |
| WWang WanchenNot listed | Not listed |
 Xu ZhanweiNot listed | Not listed |
 Hou JunjieHong Yun | Hong Yun |
 王梓霆Li Dan | Li Dan |