The reason why the novel 'Eastern Palace' had such a sad ending was because it told a tragic story. The protagonist of the story, Li Chengyin, was obsessed with love and his desire for revenge eventually led to his own destruction and the death of his lover. The novel revealed Li Chengyin's inner pain and distortion through his psychological activities and actions, as well as his understanding of the unpredictability of human nature and fate. In addition, the novel "Eastern Palace" also involved love, power, honor and other topics, which were also important reasons for the sad ending. The characters in the novel are vivid and the plot is exciting. The readers can deeply feel the inner struggle and pain of the characters, so it is easy to resonate with them when reading, resulting in sadness and sadness. The reason why the ending of the novel Eastern Palace was so sad was that it revealed the complexity of human nature and the unpredictability of fate through a tragic story, which triggered the readers 'thoughts and feelings about life and love.