Wu's Spring and Autumn Period

Once upon a time there was a school palace, and there was a master in the palace. Once upon a time there was a royal palace, and there was a king in the palace. Once upon a time there was a junior sister who had big eyes in her sockets. In ancient times, demons were rampant, the three yellows opened the eight meridians, and the five emperors preached the Dharma. Demons are rampant, and humans are attacking each other. But that's not what I'm going to tell you. This is just a despicable revenge story of a teenager. Ps: A fantasy novel with a slight background of the Spring and Autumn Period and the Warring States Period, not a historical novel