The story follows Hunter and Yat, two new hot shot recruits, who under the watchful eye of their commanding officer, Yuk Pai, rise quickly through the ranks, enduring much mental and physical hardship along the way. Their new found skills are put to the test when renegade SDU member returns from seclusion in Thailand to wreak havoc on Hong Kong and the SDU's most secret missions.

文慧（罗美薇）与友明头（刘玉翠）欲成为歌星，可惜文慧因家庭问题被迫到夜总会工作，因与黑帮头目B哥发生争执，惹祸上身，幸得车房仔阿忠（张家辉）及May姐（蓝洁瑛）、健哥（成奎安）相助脱离险境。阿忠对文慧情有独钟，但文慧一心仰慕新进男歌星Peter（吴大维）。另一方面，明头却对义薄云天的忠产生好感，一对女友的感情生活顿起波澜……

曾在黑社会号称大阿哥的老李，因妻子屡劝收山不果跳楼自杀后，终转当一楼一凤的保镳，独力抚养儿子李彭。转瞬间李彭已十八岁，是个边缘少年，跟父亲关系极不融洽，而亦因犯事被判监守行为。李彭有一好友阿东，二人同读夜校，惜李彭无心向学，并考试作弊，被Miss张训斥。李彭暗恋阿东的妹妹阿仪，阿仪在快餐店兼职，李彭经常往找她。一次恶少金十二调侃阿仪，李彭怒视金十二，竟因而被人殴伤，连带阿东亦不能幸免。老李与阿东的父亲双双赶往医院探望，二人终于在一场误会中成为老友。Miss张见李彭本性不坏，助他温习，希望他能补考升班。金十二垂涎阿仪美色，使计迷奸了她，后被李彭知悉，大怒重殴十二少，遂掀起连天大祸……

江老师（吴镇宇 饰）是学校里人尽皆知的怪咖老师，他行为举止怪异，总是依照着一时兴起之想法做事，惹出了不少麻烦，也闹出了许多的笑话，但江老师从来不畏惧他人的非议和眼光，依然我行我素，活得逍遥自在。
陈芝和阿文是江老师班上的两位美丽女生，她们于一次偶然之中解释了校外的男生迪克和阿祖，江老师得知此事，竟然走出了校门，来到两个男孩所在的班级，堂而皇之的上起了课。江老师的破格举动并没有引起学生的反感，恰恰相反，他特立独行的教学方式深受学生们的喜爱，老师和学生们打破了阶级壁垒，调和了原始矛盾，最终打成一片，结下了深厚的友谊。

屈周刊专揭人私隐，公司拥有一队训练有素的狗仔队，行动如职业特工队，随时候命四处搜罗天下丑闻。队长辛力啤与队员黑仔程和林谂临，受命跟踪四人女子乐队，到船上采访她们的行为举动，三人与乐队成员竟产生情愫，由追料变成追女仔，更与西周刊的狗仔队展开采访战。

How does fate work in love? This is main theme examined in this movie. When we begin, there are two storylines taking place, until the "fated" couples are paired...but are they really the right couples? Or has fate got another twist in store? At first Vivien is charmed by Peter's blunt nature, and Peter by her opposing stands. Meanwhile, Vicki and Nicky have a great time together, simply enjoying each other's simpleness. The tables turn however, when Peter moves to Hong Kong for family problems, and Vicki too has to leave for her studies...