Meng Mingshu had always had a high opinion of himself. Whether it was talent, wisdom or appearance, he considered himself the best and thus, the only worthy heir of the Meng family. Therefore, when he had conspired with the Dragon King to kill his fifth brother and big brother more than two years ago, he didn't feel guilty at all. Instead, he had felt a sense of duty and believed that only by taking such a dangerous measure could he reverse the decline of the Meng family.
The business of the Meng family was booming, and the family fortune was growing ever larger. So the decline was not in any financial aspect. Rather, it was their relationship with Golden Roc Castle that was weakening day by day, and how the former relationship of allies had devolved into a purely master-servant relationship.