Cao Zhen waited another five days and, after seeing Ling Xi and the others' Eight Nine Mysterious Art advance again, he finally confirmed that there must be a problem with both himself and Xiang Ziyu.
Although his progress in cultivating the Eight Nine Mysterious Art wasn't as rapid as Xiang Ziyu's, he was still making progress.
However, once Xiang Ziyu had cultivated the Eight Nine Mysterious Art to the fifth level, Cao Zhen himself made no further progress in his cultivation of the art, and he suspected that Xiang Ziyu was experiencing the same issue.
How come, among so many people, only he and Xiang Ziyu could no longer cultivate the Eight Nine Mysterious Art?
Among all the people, he and Xiang Ziyu shared one thing in common; both of them had reached the limit of the Golden Core Stage.
So, was it because of this reason that he and Xiang Ziyu could no longer continue cultivating the Eight Nine Mysterious Art?
