There are three key points in this paper: first, it discusses the function of literature about nirvana referred in "Commentaries on The Dream of the Red Chamber" by affiliating the meaning of the word "nirvana" in tantra. Second, it points out that the function of literature about nirvana referred in "Commentaries on The Dream of the Red Chamber" is actually a kind of consolation by analyzing the reason why Guo-Wei Wang committed suicide. Lastly, the paper summarizes the contention that has been mentioned to prove that "nirvana" is the topic of philosophy, not the topic of literature.