在这部不速之客悬疑/犯罪片中,下属的一个失误令身为上司的郑凯（黎明 饰）事业陷入困境停滞不前，不仅如此，他还得承担下属造成的巨额损失。郁闷至极的郑凯只能借酒消愁，在酩酊大醉之际，一位陌生的黑车司机（耿乐 饰）将郑凯送回了家并且留下了电话，此时的郑凯并不知道，这名神秘的男子，将彻底改变他的一声。
黑车司机反常的态度和疯狂的举动令郑凯感到不寒而栗，他并不记得自己和此人说了什么，那一夜两人又经历了什么。没过多久，一直为难郑凯的上司突然惨死，而郑凯则成为了警方重点怀疑的对象，只有郑凯知道，这一切和黑车司机有着脱不清的干系，而随着时间的推移，黑车司机已经在不知不觉中来到了他的身边。
Zheng Kai(Leon Lai)is a sales manager whose career is on the rise. When he planned to marry his fiancee Lin-Lin(Han chae young),his life changes dramatically--a commercial accident happened, Zheng Kai was forced to become a scapegoat. Zheng Kai frustrated to drink and get on an unlicensed car with unconsciousness and then fell into a serial nightmare--The "kindhearted" driver(Le Geng) began to call Zheng kai frequently and claimed to be his friend. The sober Zheng Kai forgot everything and felt discomfort about the driver's entanglement, meanwhile Lin-Lin became suspicious of the relationship between Zheng Kai and the driver. Suddenly accident occured again, Zheng kai's former boss was murdered by mysterious, Zheng Kai was considered as a suspected object. In order to avoid trouble, the exhausted Zheng kai tried to persuade Lin- Lin to leave here ,but an unexpected greater crisis is on the way..
一代面瘫天王演技挑战升级之作。一星给韩彩英的颜值。不速之客：秉承希区柯克的源流。不速之客。天王啊。一点都不吓人的恐怕片。《不速之客》：你总逃不过狰狞的生活。《不速之客》：相爱相杀的致命游戏。平实的惊悚片，不炫技，不花巧，不精神分裂，实在难得。。《不速之客》：让观众体会类型片的魅力。
