The reason why Jin GuangYao was so vicious was because he was abused and oppressed by his elder sister Jin GuangShan and elder brother Lan ShangXian. He had felt the warmth and lack of love from his family since he was young, so he gradually embarked on a distorted path. He thirsted for power and control, so he would fight for his own interests by hook or by crook, even at the expense of others. In the second season, in order to protect himself and Lan Lan Xian, he didn't hesitate to use his sister, Wei WuXian, and gradually lost his humanity in the process. His actions not only hurt others but also put himself in an extremely dangerous situation.