In Luoyang, the sacred capital of the Tang Dynasty, the Phoenix Seal symbolizing the identity of the queen was lost, which led to the murder of officials of the dynasty. The Phoenix Seal case caused changes in the DPRK. The conservative faction seemed to be fine, but secretly stepped up the conspiracy.Di Renjie, who was rushing to take the imperial examination, was accidentally involved in a bizarre murder case.

This drama begins with Di Renjie investigating the case and discovering that the murder case coincided with the missing Phoenix Seal. It tells the story of Di Renjie repeatedly solving strange cases in various places while performing his duties, punishing corrupt officials, protecting the coast, eradicating evil, enforcing the law, and helping the people.The story of the mystery of his own life experience demonstrates Di Renjie's life creed of integrating knowledge and action.