The expression on You Meng Zhenren's face was truly remarkable.
One moment green, the next red, constantly changing and utterly astonishing.
She knew all too well the function of the Heart-Questioning Mirror; it could peer into a cultivator's heart and discern their true thoughts.
Even some Golden Core Great Cultivators from the Demon Dao, who had cultivated to Divine Demon status, would likely find it difficult to resist.
In her own mind, even if a Golden Core Great Cultivator stood before her, they wouldn't be able to conceal their emotions or thoughts under the influence of the Heart-Questioning Mirror.
Gu Yuan, a mere Celestial Human Realm cultivator, how could he not be affected?
Yes, Gu Yuan had formidable combat strength, able to confront a Golden Core Great Cultivator with a Celestial Human Realm body.
But strength aside, Gu Yuan was essentially still a Celestial Human Realm cultivator!
