The Great Elder didn't have Chen Chun investigate the Medicine King Palace, nor did he investigate any disciples of the Grand Sky Holy Land.

Because when it came to the disciples of the Grand Sky Holy Land, the Great Elder had complete trust.

Even Mu Bai was utterly confused, but he never considered that it was an insider who leaked the information.

Mu Bai knew that although everyone in the Muyue Nation was aware of the technique, he could vouch that not a single person would leak it!