The young swordsman Bi Qiuhan and Sheng Xiang, son of the prime minister tried to find out the murder mystery of the four martial art experts 24 years ago together. As the truth gradually pointing to Sheng Xiang, Bi Qiuhan found many hidden things of the childe. Sheng Xiang turned out to be the illegitimate son of Emperor Taizu of Song and Xiaoji, the killer. And the death of the four martial art experts was because of the relationship between Emperor Taizu and Xiaoji. Bi Qiuhan was thence in a struggle. Meanwhile, powerful people came on stage, mixed with enmity of country and family. Who was right and who was wrong? 少侠毕秋寒与丞相公子圣香一并行走江湖,并且要追查二十年前四大高手被杀之谜。毕秋寒所追查的事情渐渐朝圣香靠拢,他渐渐发现这纨绔子弟身上有许多隐情。原来圣香竟然是宋太祖和杀手笑姬的私生子,当年四大高手被杀,正是因为笑姬和太祖的关系。毕秋寒因此陷入了痛苦的挣扎中,与此同时,各路枭雄纷纷登场,国仇家恨,孰是孰非……