As the character Liu Jiarong said, I have to do what I promised. This is the Chinese style of men doing things. Every promise is fulfilled seriously, and you dare to take responsibility if you dare to do it.
As a result, they are in conflict with the current arena. Police and killers are also a conflict.
But they are just as affectionate and righteous to their friends as they are to women. This sameness makes them cherish each other. So they work together to communicate with each other when an opponent appears.
In the end, Xiao Zhuang was blinded like the girl. Could this be the cycle of retribution? The criminal tried to get rid of the crime through the law, and Officer Li had no choice but to punish the criminal without passing the law, indicating that his world has changed as well, or, perhaps, it has always been like this, but he doesn't want to continue like this.
I don't know what his situation will be in the future. Will he fulfill his promise to Xiaozhuang? Or the beginning of another story, and the cycle goes on forever.
This movie shows the sincerity of friends, which is really touching...
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