Mei Changsu was a fictional character in the novel "Nirvana in Fire" and had nothing to do with historical figures. Mei Changsu's character in the movie was called Su Zhe. He was Lang Ya's advisor, good at strategy and medicine, and also one of the Qilin talents. The main theme of the play was "strategy, trickery, and love". It told the story of Mei Changsu, the "Unicorn Genius", who was extremely talented. He used his weak body to clear the fog, and Zhibo, a crafty sycophant, helped to clear many years of injustice and supported a new monarch.