The songwriting and harmony arrangement of the album "The Code of Music" was almost completed by Tiger Hu alone, and "Butterfly" is one of the main songs of the album. The song "Butterfly" was written by Tiger Hu according to the story of China folklore "Butterfly Lovers". When Tiger Hu finished writing this song and showed it to his colleagues in the company, he wrote Butterfly on the beam as a joke. He thought it was a joking way to make others think of Two Butterflies, but later he asked them to put this song on the Internet with this name, so this song was always called Butterfly on the beam before, and it was finally renamed Butterfly.