"Bugs Fly" is the Mandarin version of "A Pair of Pairs", an interlude song composed by Chen Guangrong and lyrics written by Lin Xi in the 1998 movie The Wind and the Clouds of Heroes. It was sung by Ekin Cheng, who played the role of Nie Feng, and was widely liked by the public for its nursery rhyme-like style and romantic lyrics, with many cover versions appearing later. The short score of "Flight of the Insects" is as follows: