In the film "In the Octagonal Cage", the characters are vivid, and the emotional expression is delicate and touching. The film is based on real events and has a strong realistic color. It tells the story of a group of orphans living in the mountains of Sichuan who change their fate through fighting competitions. The environmental details and character performance in the film are full of the atmosphere of the rivers and lakes at the bottom of the folk and the taste of the market, showing the wild and unbridled savage growth power. 
The every move, word and deed of the characters in the film is full of the atmosphere of the rivers and lakes at the bottom of the folk and the taste of the market, full of wild and unbridled savage growth power. The narrative in the first half of the film is very solid, interlocking, steady, eloquent, unhurried, and explains in detail how Xiang Tenghui, who opened the battlefield, met the orphans, how he had to take them in, how he made money by playing fake boxing, and how he set up a fighting club and a series of events.
In the protagonist Xiang Tenghui, the complexity of human nature is fully reflected. Xiang Tenghui can't be said to be a flawless person, he has been in prison, and there are elements of selfishness, cunning, and cowardice in his character, but he has not lost the basic moral bottom line of being a man, and his essence is kind. It was this kindness from the bottom of his heart that made him dispel his original intention of asking for money after seeing the situation of Su Mu's family, and he also made up a lie to leave some money. It is this kindness that allows him to take in homeless orphans and provide them with selfless help despite his own poor circumstances. He is stubborn, no matter how hard it is, he will not easily tell the children; He is stubborn again, trying to defend the last shred of face and dignity. The complexity of the character makes the character image more three-dimensional and diverse. 
The film also reveals the ambiguity of right and wrong of good and evil. It is commendable for Xiang Tenghui to take in the children in the mountains, help them survive, build confidence, and change their fate. However, it is obviously wrong for him to let the children play fake boxing, especially using minors to make money, which is against the law. Because of this, Xiang Tenghui will be seized by people with ulterior motives, reported as a negative phenomenon, and will be criticized by the public in the name of justice. In this way, the film touches on the complexity and multi-dimensional aspects of justice, and touches on the duality of the news and the public. The film tries to show the audience that the truth is sometimes very complex, and that good and evil are most likely not categorically opposed to each other, but intertwined.