The heroine is a British princess, but she is also a wizard
The last time she was engaged to Draco was when she was a child. Draco was lukewarm to her and only married her after Voldemort fell.
Marrying her is also lukewarm
Death Eaters came to trouble the Malfoy family, and she chose to die
When both of them returned to the branch
She is still Gryffindor and he is still Slytherin
He still looks like a high-spirited young man, and he still chokes Harry and the others like that.
But they carefully want to repair their relationship
She thought he was the original him, but as the story developed, he gradually changed from the original one.
Intention: Gradually change because of love