Bu Ran, meaning undyed, was performed by Chinese singer-songwriter Mao Buyi as a theme song for the 2018 fantasy romance drama Ashes of Love. The song's restrained delivery and imagery of untouched purity matched the drama's central love story and helped it become one of Mao Buyi's most recognised works. Since then, short excerpts have circulated widely in fan edits, tribute videos, and emotional montages, where the melody is instantly recognised by viewers familiar with the drama. Its lasting appeal comes from that association with longing and quiet devotion.