After the Immortal Realm Collapsed, I Took In a Fallen Fairy

The immortal realm is gone, and an immortal maiden is worth just ten spirit stones. I bought her and brought her home. She hates me to the bone, yet has no choice but to acknowledge me as her master. The System says she’s a Nascent Soul powerhouse, but now she has to watch my expression just to get a drink of water. Don’t call her an immortal maiden. Call her Master. A haughty fallen immortal maiden × a scheming male lead who raises her: watch how the protagonist turns a wildcat into a caged songbird, starting with a loyalty score of -100.