A group of aliens has come to Earth to learn about its population, customs, etc. To avoid detection, they have taken on human form which gives them human emotions, physical needs etc. WITHOUT the understanding of what they mean or the inhibitions normally present in humans. Their leader takes the position of a college professor, their military expert as his sister, their intell...。哥哥孙义和弟弟孙礼都是反清分子,一场暗杀行动失败导致弟弟远走异乡,而哥哥为了生存,成为清政府的一名地下狙击手。多年后,俩兄弟再次相遇在暗杀行动中,亦似兄弟,亦似仇人,俩人必须做出艰难的选择。。