If a song appears in a TV series, it will also be mentioned in the relevant introduction of the song, but this song does not. Because if it is an episode in a TV series, it will definitely be mentioned on the page of the TV series. Perhaps because this song is an antique song, it is more suitable for editing an antique TV series, so it can give the audience a feeling of being in the play.
The audience who are interested in this song can listen to this song, but this song is not the song of any TV series. Although sometimes the audience can match the picture with the lyrics in the song from some clips, it doesn't mean that this is a song in a TV series.