Among many materials, the evaluation of Li Dazhao is basically: calm, modest and cautious. But how to show Li Dazhao's firm belief and persistent pursuit of Marxist struggle? Especially how to reproduce Li Dazhao's integrity? In his creation, Sun chose two plays as the focus: one is the struggle of the extreme right forces of the Kuomintang during the first cooperation between the Kuomintang and the Communist Party; Second, in the speech of young students trying to find the right way to really save China. When looking through the materials, Mr. Li Dazhao's couplet entitled "Writing with Iron Shoulder" caught Sun's attention. A word "Miao" made him feel the core of the character and let him grasp the basic points of the character. In this way, in the preparation and shooting of these two scenes, he has been using Miao to design the behavior of the characters. Sun said: "He is different from Chen Duxiu in dealing with the enemy and all kinds of wrong ideas in the Party. He is well-founded and persuasive, with a quiet and calm appearance, but his heart is like hot magma. When hearing the news that workers in Changxindian were robbed and worker Zheng generously died, his eyes were full of anger. From the bottom of his heart, every line was almost crooning but powerful. At the scene of the "Nankai" speech, he was also different from Chen Duxiu's angular and aggressive. Instead, take a pair of old-fashioned cloth shoes as an introduction, explain your point of view step by step with rationality, and communicate with your classmates with a smile and humor close to your father's brother. "

There is a scene in which Chen Duxiu is imprisoned. Li Dazhao and his wife Zhao Renlan went to visit the prison with a basket of eggs, but they were refused by the prison guards. Li Dazhao picked up the egg and threw it at the prison guard. When I first read the play, Sun didn't quite understand Li Dazhao's move. How can an open university professor be so calm and make such an almost childish behavior? But from one of Li Dazhao's lines, he found a feeling: "Zhongfu is a banner!" " "The confrontation between the two armies, the flag was put into prison by the enemy, how can you not worry? Therefore, when shooting this scene, Li Dazhao, played by Sun, couldn't help being angry with the reactionary government, and wanted to throw the eggs out, showing the angular side of Li Dazhao's personality and shaping the characters very plump. In addition, Sun has also done a lot of work in shaping human feelings. For example, the delegation led by Mao Zedong was trapped in Fu You Temple, without food and clothes, and its morale was shaken. Li Dazhao personally sent rice, oil, salt, pepper and charcoal collected in the cold, laughing and guiding young Mao Zedong to realize the absurdity of "the founding of Hunan". Therefore, experts praised it as the most appropriate work to portray the image of Li Dazhao in recent years.