As soon as the story of "Floating Dream Song" begins, the audience is dragged into a vortex of rivers and lakes full of grievances and hatred. Su Meng Yan, the daughter of the head of the Liuying Sect, and Fu Sheng, the young master of the Lengyue Sect, were originally a match made in heaven, but they were trapped in the quagmire of fate due to the disputes between the two sects. Su's father, Su Yao Tian, was obsessed with power and designed to kill Fu Sheng's parents.
Modern teen Qin Fang, born into a renowned swordsmanship family but lacking skill, is transported to the Qin Dynasty. Forced to survive in a brutal world, he embarks on a journey of growth. Along the way, he meets Meng Yu, an orphan from a rival tribe who secretly protects him and ultimately becomes his sword spirit.