In Who Is He, Zhao Shijie's brother is Zhao Shiduo, played by Gao Feng, whose original name is AG. In the play, Zhao Shijie is fearless, but when he talks about his brother, he is full of fear. He seems particularly afraid that his brother will know what he has done.

In Who Is He, Chen You plays the role. In the play, Chen is the younger brother. Because of his brother's death, he became rebellious and perverse. Chen blamed Wei for his death. He insisted that Wei was a coward and didn't protect him well. Chen went astray under the leadership of Chen and refused to listen to persuasion.

The plot develops to a climax.

Every time he appeared, Chen couldn't wait to curse Wei once. Now he's following Zhao Gang, and he's a real rascal. After Wang De sent it, he deliberately lived across the hall from Wei Xiaoxia and told Wei Guoping that he lived where he lived, and then he did Wei Xiaoxia's thing. It was his own freedom, and Wei Xiaoxia was forced to move away.

Wei, played by Zhang Yi, is called the Guardian, who lost his comrade-in-arms Chen in 1988. He has a lot of guilt and unwillingness in his heart. He is determined to find the real murderer, and he will not let go of any clues in order to cut his throat. He is stubborn and a little stubborn, because he is afraid of seeing the murderer escape again, so he is desperate to relate the dismembered body case to the August 8 case.