People that are trapped in this " infernal hell " have to suffer from endless tortue of combustion . it parallels to the situation the two characters are entangled in . their identities are kept secret and they have to live in the dark and suffer from great pressures every day 这个无间地狱，恰好和片中两个男主角刘德华和梁朝伟的处境相似，两人分别为黑帮和警方派往对方组织的卧底，真正身份不能暴露，每天活在黑暗中，受尽压力。
