Youthful sword immortal Li Qingming has his cultivation entirely destroyed due to a secret realm upheaval, and becomes entangled in a predestined yet baleful romance with demonic sect enchantress Pei Zhinan, accidentally fathering a half-demon daughter, Pei Zhulu. To protect his daughter and reforge his foundation, he navigates between his master, the demon woman, sects, and the demon clan, investigating the Demon-Slaying Division and the Taiping Immortal Sect, ultimately building Zhulu City where humans and demons coexist amidst prejudice and conspiracies.