1991年，香港黑帮三合会会员刘健明（刘德华）听从老大韩琛（曾志伟）的吩咐，加入警察部队成为黑帮卧底，韩琛许诺刘健明会帮其在七年后晋升为见习督察。1992年，警察训练学校优秀学员陈永仁（梁朝伟）被上级...
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">
">