一(🌠)对(duì )孪生兄(xiōng )弟(dì )王(wáng )名(míng )成(📼)(刘青云(yún ))与王(wáng )利(lì )(🕋)就(周星驰)自(🤢)小失散。名(🎗)成与母相依为命,利就则为老粗鲁辉(梁家仁)收养,改名(míng )为鲁(lǔ )细。成是(🕔)电(diàn )(🔸)影圈的(🤷)新进导(🎡)演,为(wéi )人(rén )精明有绰头,敢作敢为;细则为通(tōng )天经(😚)纪,性格(gé )爽(🚸)朗具正(🐶)义感。机缘巧(qiǎo )合(🔊)下两(⏺)人相遇(yù )并(🧚)共住一屋(wū ),但(🚨)却不(bú )知大家的真正身份。细(㊗)钟情于童年(nián )(🙂)好友方(fāng )嘉楠(陈秀雯),嘉(👓)楠是(shì )名成的(🎾)下属,对名成心仪已久,兄(🕙)弟两人更闹出(chū )一段纠(🥕)缠不(🐀)清(qīng )的三角(jiǎo )恋爱。鲁辉(huī )认识了嘉楠的阿(ā )姨卓(zhuó )龄(líng ),她(tā )为人(rén )高(🦇)贵具教养,与辉分属两个世界,但(dàn )(🌼)龄欣(xīn )赏(📟)他为人老实(shí )忠诚(💿),最后与他展开了一(⏲)段(duàn )浪漫恋情。兄弟两(♌)人最后终于相认,但(dàn )因性(xìng )(🌂)格(🔙)各异而心(xīn )存隔膜。后名成与友人合伙(🍁)营商,却(què )(😳)被骗而惹上官(guān )非,患难(nán )中(zhōng )细(🧘)明白到(❓)兄弟情(🕺)之(💑)珍(🎴)贵,与(🚩)众人共(🏸)施(shī )计策(cè ),营救胞兄(🈳)。