"Defeat the Demon" is a music work by Beyond, a rock band from Hong Kong, China. This song is a song in "Happy Ghost 4 - Happy Ghost Saves Happy Ghost", and its Mandarin version is " "Race with My Heart" is the theme song specially composed by Wong Ka Kui for this movie. The song calls on young people to not be afraid of hardships, conquer their inner demons, overcome everything, and achieve their goals.