Is there any novel in which the female protagonist has a strong background, but keeps hiding her identity, and finally shocks everyone, especially the male protagonist?

The Ghost King's Gold Medal Concubine

Summary of content: Once she traveled through time, she became the ancient version of Cinderella. Not only was her fiancé snatched away by her sister, but she was also pushed out by her father to give birth to others. ——Joke! She has always been the one to kill people, when will it be their turn to be arrogant! Hit her? OK! One shot will make you unable to lift your right hand again! Scold her? become! I'll kick you into the ice lake and feed the carp! Assassination? good! Let you not see the sun tomorrow! What? Want her to celebrate the death of the ghost king who was so bloodthirsty that all eight of his wives died on their wedding night? no problem! She is a "witch incarnate" who understands both black and white, and she wants to see who of the two is more bloodthirsty! Who is more ruthless! After marrying into the palace, she realized that this ghost king was completely different from the rumors outside. Not only was he poisoned by strange poisons and he had to take medicine every day, but he also had to endure the pain of bone erosion and heartache every full moon night. The man's frail appearance made her gradually let down her guard and feel pity for him. She swore that she would repay the person who made him like this a thousand times, no, ten thousand times! It's just that this man seems different from what he sees on the surface...

ps: The introduction is average, but the article is absolutely classic, I hope you will adopt it