不能打开的开关

There was a monk who stood on the back of a black bull to go to the original Zhuhu Lake. The monk later left. His black bull seemed to be not simple. After Qiao Kairui, the old man from the Demon Realm, finished speaking. Looking at the strong man in the demon realm, Tianji. He could tell that this black bull was something special, and Tianji had obviously noticed it a long time ago....