The Abandoned Concubine of the East Palace

When she was sent to the East Palace, everyone knew that she was an outcast. No favor, no children, no support, even living is like a random charity from others. But no one knows that what she is best at is not accepting her fate, but keeping accounts. Whoever wants her to die owes her first. From deposing a concubine to making a comeback, from abandoning a son to playing chess, she will get back everything the East Palace owes her.