The Shadowed Heart

A young girl born into abusive parents, find her first love at a 20 age, but he kills her best friend, and she tries to kill him but she gets murdered by his best friend, though she was a Dragon demon that was born in that family without any memory until she reincarnated as daughter with a rich family but hates her because she's different, she discovers her powers and she turns immortal, powerful, and no one knows who because she's unidentified, like if she wasn't in the system. Throughout the story, she has a grudge and will kill anyone who was like those people from her past life.