The female protagonist unknowingly killed the male protagonist's only relative, which made the male protagonist hate her to the bone. He and his sister unjustly killed the female protagonist and imprisoned her demon pill for two thousand years, erasing every trace of the male protagonist and the female protagonist. When she was about to disappear, she exchanged her soul and body with the demon king who suddenly appeared. The price was to become his demon concubine. After being reborn, the female protagonist was shown to have killed the sister who framed her. Then she went to the mortal world to approach the male protagonist to find an opportunity to kill him, but the male protagonist fell in love with her. The female protagonist took the opportunity to approach the male protagonist for revenge. Later, the male protagonist learned that the female protagonist was the murderer of his only relative but did not want to hurt the female protagonist and decisively chose to leave. The Demon King found the heroine and wanted to use her to sacrifice his wife. When the hero found out, he rushed to rescue his "cat" at all costs. In the end, he was a step too late. Fortunately, the heroine's soul was stronger than the Demon King's wife and occupied all the Demon King's wife's demon power to become the new Demon King. The Demon King died due to the backlash. The male protagonist stayed to support her.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.