Why did Diamond sing the original song of "Tree Rings" by the silent king?

The original song of "Annual Rings" is "Diamonds", written by the silent king.

The annual rings were written by the silent king. In order to make this song more suitable for the cruel plot of TV series, Wang Mo read "Flowers" many times, and realized the complex emotions in the novel before writing. After setting the tone, Silent King constantly considered the details, and completed the creation of "Annual Rings" with strong Chinese style tunes and sentimental melodies.

Appreciate:

The sadness contained in Diamond's voice in "Annual Rings" combines her Korean lyric singing, which is refreshing and gives the song a feminine flavor of "Korean lyric". In this song, the piano sound as clear as jade splashes against the sad tone. The whole song conveys the sadness that "the most poisonous hatred in the world is doomed but inseparable" and reminds the audience of the beautiful but desperate love in China.