一对孪生兄弟(dì )王名(⛲)成(刘青云)与(yǔ )王利就(周星驰(chí ))自小失(🕰)散。名成与母相依为命,利(lì )就则为老(lǎo )粗鲁辉(梁家仁)收养,改(gǎi )名为鲁细(xì )。成(chéng )是(🖲)电(diàn )影(yǐng )圈(quān )的新进导演,为人精(jīng )(🕯)明有(yǒu )绰头,敢作(🛹)敢(🚉)为(wéi );细则为通天(tiān )经纪,性(😚)格爽朗具正义感。机缘巧(qiǎo )合下两人(rén )(🔊)相(💞)遇并共住一(🧚)屋,但却不(bú )知大家(⏯)的真正身(❔)份。细(xì )钟情(qíng )于(㊗)童年好(hǎo )(💻)友(🗞)方(🙂)嘉楠(陈秀雯),嘉(jiā )楠是名成的(🙉)下属,对名成心仪已(yǐ )久,兄(xiōng )弟两人更闹出一段纠缠(chán )不清(qīng )(🥕)的三角恋(liàn )爱。鲁(⚾)辉(🕯)认(rèn )(🌮)识了嘉楠(🈁)的阿姨(💹)卓(💔)龄,她为人高贵(🚗)具教养,与辉(🏻)分(fèn )属两个(gè )世界(jiè ),但龄欣(💅)赏(🌼)他为人老(🐩)实忠诚(chéng ),最后与(🎥)他(tā )展(zhǎn )(🈺)开了一段浪漫恋情。兄弟两人最后终(zhōng )于相认,但因性格各异而心存隔膜(🆙)。后名成与友人合伙营商,却被(bèi )骗而惹上官非,患难中(👚)细明白(👩)到(dào )兄(xiōng )(💅)弟情(❓)之(📬)珍(✖)贵,与(yǔ )众(😉)人共(🚩)施(shī )计策(🏸),营救胞兄(xiōng )。