In fact, the human kindness role was given by himself, because he did not experience the ups and downs and tribulations of Xin Zuo. This role is ironic. If the role of the story is changed, the planet Luo Mulan is a peaceful scene, while the people on earth, as a low-level and unpopular species, are in the midst of suffering (which can be man-made and natural). On the day, the earthlings will become the protagonists of revenge. People's spirit of revenge is universal, so revenge is human nature, not owned by the specific character Xinzuo.
So there is no need to pretend to be good, and no need to shirk evil as Xin Zuo's own desires. He is a man, and man is him.
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