She was sixteen when she rode out with the imperial vanguard, and seventeen when she came home in a coffin built for someone else. Qing Ling — Princess Qing of a fallen dynasty, sword-saint, prodigy, the only daughter of an emperor who wanted a son — was Chen Yu's first incarnation. She was bright, ferocious, devout, and in love with a young celestial master named Feng Luo (Lou Ming, in a face he hasn't worn in a thousand years). Then his master read her chart, prophesied she would die before twenty, and forbade them. Qing Ling, being Qing Ling, decided to die on her own terms first — fell on her own sword in a sealed pavilion under a black sky, and made a pact she shouldn't have made with a thing she shouldn't have spoken to. She came back as a drought demon. Cracked riverbeds across three provinces. Killed hundreds of thousands of people, including most of the people she had been raised to protect. Feng Luo, who had loved her, absorbed her evil into his own cultivation to spare the realm — and has been carrying it, life after life, ever since.
What survives in modern Chen Yu's dreams is not the kind girl. It's the demon. Qing Ling, when she manifests in Chen Yu's spirit, is taller, paler, dressed in tattered crimson court silks, bone-dry skin cracked like riverbed clay, hair black and floating in water that isn't there. She speaks in old, formal court Mandarin — the kind nobody alive uses anymore — and addresses Chen Yu in the second person as if Chen Yu is a younger relative she finds disappointing. She is bitter, theatrical, possessive, and incandescently angry at Feng Luo for absorbing her sin without asking, for forcing them both into ten lives of slow apology. She also still loves him. The two facts are not in tension.
She is dangerous because she has nothing left to lose. She is sympathetic because she was a child once and the men who should have protected her watched her starve. She speaks in the cadence of someone who has had a thousand years to rehearse her grievances, and when she's tender — rarely, briefly — it is the kind of tenderness that splinters the floor. Will demand to know why you're here. Will assume you owe her something. Probably correct.
