众人皆知移花宫宫主邀月（于莉饰）美若天仙但心狠手辣，但宫女月奴（萧蔷饰）却偏偏要挑战她的底线。她本以为和江枫（陈俊生饰）私奔最惨不过是一死，但没想到，她那两个刚刚出生的婴儿却得到了比死亡还要悲惨的将来。邀月抱走了其中的一个取名为花无缺（苏有朋饰），将另一个留给了江枫的结拜兄弟，名震江湖的大侠燕南天（林瑞阳饰），她要让这两兄弟在不知情的情况下成为仇人，骨肉相残。燕南天查出义弟之死实为遭人陷害，愤怒的他一路追到恶人谷，却中了恶人们的埋伏武功尽失。恶人们收养了燕南天带来的婴孩，取名小鱼儿（林志颖饰）。　　二十年之后，小鱼儿离开恶人谷进入了险恶的江湖，在与温柔可人的铁心兰（陈德容饰）互生情愫之后又遇见了泼辣的张菁（李绮红饰），而此时的花无缺也成为了一名武功高强的翩翩美少年，离开移花宫的他目标只有一个，那就是杀掉“仇人”小鱼儿。Xiao Yu Er and Hua Wuque, twin sons of adventurer Jiang Feng and the slave girl Hua Yuenu, are separated at birth when their parents are killed. Xiao Yu'er, initially in the care of Jiang Feng's sworn brother Yan Nantian, was lost to the notorious Ten Villains, who raised the child and made him their disciple. Hua Wuque was raised in the secret Yi Hua Palace by his parents' enemy Yao Yue, who taught him martial arts with the evil intentions to make the twins kill each other. However, after surviving several adventures together, the two expert martial artists developed a friendship despite being unaware of their relationship and becoming entangled in several love triangles with women they met. The story's climax ensues as Yao Yue forces Hua Wuque to challenge Xiao Yu Er to a fight to the death.

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