The Prime Minister's Daughter Is Actually the Empress Dowager's Granddaughter

She was the prime minister's daughter and lived a stable life. However, her mother strongly opposed her involvement in royal affairs and did not allow her to go out. Since she was a child, her younger sister could go out with her father to meet powerful people and attend the banquets of famous princes, but she was the only one who couldn't do it. She didn't understand. By chance, she discovered a secret...