She has lived in the light since she was a child, and he has lived in the darkness since she was a child; she has been lively and cheerful since she was a child, and he has been gloomy and talkative since he was a child.
Her parents were both police officers. They died accidentally while on duty, so she moved into his house. She loved to laugh, and every smile healed him. Every time he was in darkness and couldn't extricate himself, she appeared again. After getting along for a long time, he developed a strange feeling for her.
It's just... She doesn't like herself, that's okay. I believe she will like him after getting along for a long time.
Intention: a sudden whim