"Nine-Nine Sunny Days" is an interlude written by Gao Ruxing for "The Story of Liubao" when he was 24 years old. The song describes the beautiful scenery of early spring at the end of winter. It adopts typical Jiangsu folk songs.

"Sunny Days" is an episode that transcends ordinary movies. The song describes the beautiful scenery of early spring at the end of winter and has become a symbol of simple, sincere and lingering love. Moreover, the song structure is simple and catchy. The movie screening process is like teaching singing, and the audience can almost sing it by heart after watching the movie. ?The lyrics of this popular and widely circulated movie song make extensive use of folk materials and expression techniques such as fubixing, question and answer and repetition in folk songs, making the whole song full of lively vitality and having a solid foundation in life. The song mode is the traditional hexatone mode with the pentatonic mode as the backbone. The melody is mainly progressive sound patterns with small jumps in between, making it beautiful in melody, bright in rhythm, soft and melodious, graceful and pretty, and the range span is not large. It adopts The typical minor-key expression technique of Jiangsu folk songs is like a ditty hummed during work and leisure, or like a duet of young lovers, full of vitality and life-likeness. The melody of the song is beautiful, the tune is lively and euphemistic, the lyrics are sincere and simple, and it is full of rich local flavor and folk song interest. It makes people never tire of listening to it and never forget it. This song is deeply loved by the audience and is a classic music piece that has been sung for half a century and still maintains its vitality.