林超賢
Director Dante Lam explained that the title of the film originates from the traditional fire dragon dance that Hong Kong residents used to practice to drive off pestilence and that he believes that there is pestilence in every human's soul that must be beaten out. To prepare for the action scenes, Leon Lai prepared for these scenes by exercising, jogging and swimming. Richie Jen stated that Lam wanted him to "lose weight to add more shadiness to my character. But before making any extra effort, I found myself thinner thanks to the hot weather and so many fighting scenes to shoot." Lai suggested the both Jen and him should sing as a duet for the theme song for the film. Jen stated that he "felt strange. But I liked the song instantly when Mark Lui finished it. We hope the song can lead the audience into a deeper understanding about the movie."