The entire narrative of "Farewell My Concubine" is a crescendo toward inevitable tragedy, foreshadowed from the beginning. The central hidden meaning that becomes clear is that Dieyi's entire life is a performance of the opera's central theme: unwavering loyalty unto death. His unrequited love for Xiaolou is not just a personal desire but a manifestation of his artistic identity as Concubine Yu. The key plot twist is the extent of Xiaolou's betrayal during the Cultural Revolution. Under pressure from the Red Guards, he not only denies his love for his wife Juxian, calling her a prostitute, but also publicly denounces Dieyi, exposing his homosexuality and accusing him of counter-revolutionary acts.
This public humiliation shatters the foundations of both relationships. Juxian, seeing that the man she dedicated her life to would cast her aside to save himself, hangs herself. This act fulfills an earlier, broken promise she made to Dieyi to leave Xiaolou. The film's ending, set in 1977 after the Revolution has ended, brings the two men together again to practice their famous opera. When Xiaolou recites the King's line, Dieyi responds with the Concubine's climactic performance. He takes Xiaolou's sword—the symbolic object of their bond—and commits suicide on stage, perfectly mirroring the opera's ending. His final, whispered name is not Dieyi but "Douzi," the childhood name Xiaolou called him, signifying a return to the origin of their bond at the moment of its ultimate, tragic conclusion. The final act is not just a suicide but the complete and final merging of his life with his art, the only way he can achieve the perfect, unending devotion he craved.