To control Wugen Black City, it is absolutely impossible to rely solely on killing. He must kill the chicken to scare the monkey, use the most powerful means to kill Mao Xiuxuan, and then establish his power. As for letting Mao Xiuxuan go, Ning Cheng had never thought about it. He didn't want to be like Xiang Yu, who didn't kill Liu Bang even if he gave it to him....