At first, the two were incompatible with each other, and the struggle was fierce, which also made Tan suffer deeply. But as the story goes on, Tamburton gradually finds that people who are not exposed to darkness are not enough to talk about light, and that getting rid of evil kindness is just to escape from self-deception in the face of world suffering.
With the development of the plot, the two "I" gradually accepted and merged with each other. The first step of self-reconciliation was that when Tan Er didn't come out again, it was also the moment when he began to shield Song Chengmin. Was he shielding the revolutionary justice in his heart? No, it's his selfish heart, it's his evil, because he doesn't want to lose Jiazhen. He began to learn to get along with the dark side of his own humanity. He began to understand that all justice and fairness in the world are relative, so in the end, he struggled to choose the just self-confessed that it was indeed Song Chengmin, while the evil self resolutely refused to tell the reasons for shielding it, and reached the second step of self-reconciliation.
And Jia Zhen's injury and death made him thoroughly understand that there is no absolute fairness and justice in the world, which made his ideal society collapse. It was not someone present who killed Jia Zhen, but this unbearable world, so he finally chose to let Song Chengmin go. In his mind, he realized that the guilty man was innocent. This is also the end of his self-growth.
This idea is profound in today's domestic dramas, but I think most people may be crazy about seeing such a bloody character setting, which is why there are so many bad reviews.