The famous saying "I don't know what I'm feeling, but I'm going deep" is not from the poem, but from the famous Peony Pavilion by Tang Xianzu, a dramatist in the Ming Dynasty. This work has become a classic in the history of China opera with its profound theme and beautiful wording. Peony Pavilion is a legendary play, which tells the love story of Du Liniang and Liu Mengmei. Du Liniang fell in love with Liu Mengmei in her dream. After waking up, she fell into lovesickness and eventually died. Three years later, Liu Mengmei met Du Liniang in her dream and learned that he was buried in Meihuaguan after his death, so she dug a grave and opened a coffin to save Du Liniang, and they finally got married. The Peony Pavilion is not only a play, but also a discussion of human nature.