Vincento's Weakness

A real definition of 'The Devil' is someone who'd have an amused smile on his face when the world is burning to ruins, someone who'd create chaos to watch like a spectacle, and someone who goes crazy over the scent of blood. That best describes Vincento Roberto, a ferocious mafia who stole the throne from the devil immediately he was birthed. He has endless number of dead victims who had their share of his dark heart, both guilty and innocent, and in the midst of his victims, she stood out. A girl who lost everything to him, he got rid of all her family in a day, leaving her in ruins and nothing but agony to dine with. He left a piece of his dark heart behind, and she etched it into hers, she must get her revenge for everything he took from her. She'd give him a gift worse than death and make him beg for his life on his shredded knees. Finding his weakness made thinghs easy, and now she only has to penetrate into his domain and plant pains in his existence. Will this be possible? What's the Devil's Weakness? How will she get to him. Will she be able to her Revenge. Who exactly is she? Find Out!!!