Before her rebirth, she fell in love with his illegitimate brother, and he let her fall in love with him. As a result, one of them had a car accident and the other fell from the building.
After rebirth, she knew that she had mistakenly fallen in love with a scumbag. Although she didn't love him, she was willing to try to love him.
The childhood sweethearts gradually got together, abused each other, and then had babies.