上古洪荒，仙人修封魔塔并以“无尘神剑”封印魔界。数百年后无尘剑离奇失踪，守护者剑圣（何华超饰演）不愿牺牲自身修为，竟抽离初生的“纯阳之子”忘生的一魂一魄用以封印魔界，濒死的忘生被剑圣师弟酒仙（张德晖饰演）所救。二十四年后，忘生（谢苗饰演）和从小相依为命的少女一一（敬佩饰演），偶遇蜀山女剑侠风若离（诺瑶饰演）三人结伴踏上险恶的除魔之路。与善良的魔村村民之间的纠葛，令忘生感悟到魔物也有善恶之分。

In ancient times The Immortals built the magic tower and sealed Demon World with the "Dustless Sword". Hundreds of years later, Wuchenjian disappeared bizarrely. The guardian Saint of Swords is unwilling to sacrifice his own cultivation, so he siphons off the soul of his newborn son, Forget-Sheng, to seal the demon realm. Twenty-four years later, Forget-Sheng (Xie Miao) and Yi (Jing Pei), his best female friend from childhood, meet Feng Ruoliu (Nao Yao), a swordswoman from Shu Mountain, and the three of them embark on a treacherous journey to rid the village of evil. The tangled relationship with the kind-hearted villagers of the evil village makes Sheng forget that there is a difference between good and evil.

마계를 봉인한 무진검이 사라지자 세상에는 마족이 날뛰게 된다. 부모 없이 서로 의지하며 떠돌며 촉산 제자가 되길 꿈꾸는 망생과 일일은 어느 날 속세로 온 촉산 제자 풍약리를 만나게 되고 함께 마족에 맞서게 되는데…