She was kidnapped by the emperor when she was born, just because she had a heart for immortality. He kept her for a while because of his selfishness, and then he was sent down to earth to become the regent, but he fell in love with her unintentionally. Later, in order to keep her safe, he made her his slave. And her fate was changed by the emperor. This fate was for him to grant her death. After she died, he fell in love with her again. In order to see her again, he did not hesitate to share a spiritual body with the Demon Lord in order to reconstruct the past. He saw her die again as a bystander, but there was nothing he could do. In one reincarnation, she became the prime minister's daughter and conquered the country. Will she accept his marriage certificate?