Perseverance goes hand in hand. The plot introduces a series of stories about Luo Song and Gao Chuan, two heroes of the police, who trace the accidental death of their teacher Cheng Fenghua. After Cheng Fenghua's death, Gao Chuan left the police force for some reason, but he was still obsessed with investigating the truth of the teacher's death.

Yuan Ruitong, played by Zhu Yanmanzi, is the last big boss. After Jia Jia's death, she started a crazy revenge plan, in which those who killed Jia Jia and her mother were involved one by one. Finally, what I remember most clearly is what Yuan Ruitong said to Luo Song, "I can't wait for your justice _, I'm sorry".

The fifth episode:

During the trial, Sun told the truth that he had an accident at work and lost his sexual function. Luo Song found out that he was investigating the wrong person. Luo Song reanalyzed the situation and thought that the murderer was very familiar with the monitoring situation of the song and dance troupe, so he suspected the security of the song and dance troupe. At this time, Li remembered the name he revealed when he asked the security guard about the situation.

Luo Song immediately returned to the Song and Dance Troupe with Dong Li after learning about this situation, and investigated and asked Sun Jianye about the discovery of Luo Xiao's buttons. Only then did he know that Jia had found the button. Knowing this situation, I immediately went to find Jia who was patrolling the warehouse. At this time, Yuan Ruitong happened to go to the song and dance troupe and was met by Jia.