The song "When Love is a Thing of the Past" was previously composed and sung by Li Zongsheng, but later the movie "Farewell My Concubine" was released. Because the artistic conception of this song is very suitable for the movie, it was chosen to become the song. The ending song, this song was sung by Leslie Cheung after creating a strong aura throughout the movie. It immediately captured the hearts of a large number of viewers and its influence exceeded that of the original singer. In fact, the original song is also very good, but the meaning is slightly different.