Who caused Gu Zhao in silent reading?

In the novel Silent Reading, Gu Zhao was framed and killed by Lu Guosheng. However, Lu Guosheng was not the only murderer. There are other participants in this case.

In the plot of the novel, Gu Zhao is a policeman who is chasing the fugitive Lu Guosheng. However, he was framed for killing Lu Guosheng's relatives and was appointed as an internal black policeman. During the investigation, Professor Fan Siyuan was Gu Zhao's teacher. In order to find out the truth, he conducted an investigation in secret. Although he finally found out the facts, he chose to take revenge in private and didn't tell the truth.

Therefore, it can be said that Lu Guosheng directly killed Gu Zhao, while other participants, including Professor Fan Siyuan, were not directly involved in the killing, but they were also responsible. Their behavior led to Gu Zhao's sacrifice and made Professor Fan Siyuan embark on the road of revenge.