the dad is not any better. he had a chance to raise her and chose not to.

To be fair, he's a chaebol. His father told him to let the other son take care of her. And that's what he did. Then he always planned his trips back to the states instead of taking random visits back, so that family had time to get her back to looking like a normal child instead of a beaten and neglected one. Rich families are VERY smart about how they abuse their young.