落魄龙套富贵（潘斌龙饰）意外获得老挝旅行团门票，参加了一场以表演为主的剧本杀游戏。富贵用心扮演特工角色，却误入了黑帮争斗之中，把一切当作游戏的他自信满满，凭借多年沉淀的演技面对所有困难。啼笑皆非的冒牌特工，别开生面的演技对决。随着阴谋逐渐暴露，剧情也逐渐失控，他将何去何从.....名侦探柯南678...

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