What is Ni's Infernal Affairs about?

It's about aristocratic life. "Ni Zhiren" describes the life of the Ni clan in the Song Dynasty, vividly shows the aristocratic culture of the society at that time and shows the truth of human nature. Ni's Benevolence is the work of Ni, a Neo-Confucianist in Song Dynasty. The book began in the fourth year of Yan You (1086), and recorded the history of Ni Zhengqing, the ancestor of the Ni clan, to his descendants for more than 200 years.