成为魔王的方法

Yu Zheng's cave was built very strangely, inside a huge rock. Moreover, the surrounding space was not very stable. Ning Cheng doubted whether a volcano would suddenly erupt here or something. But considering that Yu Zheng is a fourth-level body-refining monk with a king's body, even if a volcano suddenly erupts, Yu Zheng probably won't be able to do anything....