Modern urban setting + reborn + no romance + a ruthless heroine who stands alone + rejects emotional blackmail + a cast of villains + satisfying revenge + healing and self-rescue
In her previous life, the heroine was gentle, sensible, and devoted to a fault: she put her younger brother through school, paid off her family's debts, sacrificed her education and career, and swallowed every grievance to accommodate everyone around her.
In the end, her family drained her of everything she had. She died of illness, and no one even came to claim her body.
She is reborn at the moment of her greatest sacrifice, just before choosing her college major or dropping out to work.
The heroine awakens and turns ruthless:
Kindness is useless. Being sensible is a death sentence. From today on, I love only myself. Anyone who tries to guilt-trip me can see just how crazy I can get.
Suddenly I thought of the scene when I was a child, my younger brother was favored and I was scolded every day.