'Records of the Eastern Zhou Dynasty' is a historical fact? Or a novel?

" Records of the Kingdoms of the Eastern Zhou Dynasty " was a historical novel that fabricated the history and characters of various vassal states during the Spring and Autumn Period and the Eastern Zhou Dynasty. Although the plot of the novel is different from the historical records, its literary value and influence in Chinese history cannot be ignored. The novel was also adapted into various TV series, movies, games and other forms of works, which were deeply loved by Chinese readers.