The boss of the Axe Gang, Brother Sum (琛哥) is named after Hon Sam / Hon Sum (韓琛), the triad boss played by Eric Tsang in Infernal Affairs.
Bos Geng Kapak, Kakak Sum (琛哥) mengambil nama dari Hon Sam / Hon Sum (韓琛), bos triad yang diperankan oleh Eric Tsang dalam Infernal Affairs.