CEO Tang Yiyi's brother Tang Zihao—a gambling addict—conspired with their mother to murder her and their father for inheritance. At death's door, Yiyi miraculously revived after obtaining the Book of Life and Death, a celestial ledger recording every mortal's lifespan and demise. Shocked to discover its power, she repeatedly saved her father and others from Zihao's schemes. But Leng Rui, the book's true guardian (and sentient spirit), came to reclaim it. Their initial clash evolved into love as they united to defeat a demon sealed within the ledger.