Ice and fire can coexist, and two unrelated people become lovers.
He laid down his life for her, and she took good care of him.
They wandered around the world together, visiting forbidden places in the world and ancient wastelands.
He gave her his heart and she gave him back her blood.
However, when a good thing was about to happen, she was deceived by the devil and sacrificed her years, which was self-defeating and missed both times.