Three Lives and Three Lifetimes of Long Memories

In her previous life, she was a princess in heaven, but she fell in love with him, who was still an unknown person at that time. In the end, she fell into the mortal world to protect him and lost all her memories. In this life, she ascended to immortality and met him again. The two of them worked together to solve many mysteries in the heaven, but they were sentenced to earthly calamity for mistakenly trusting the villain. After many twists and turns, he died for her, and she became a demon because of him. Whether it's a fairy or a demon. I want you to be safe and sound.