According to Li Moying's experience, almost all the doctors in the twelve continents of the Gods Race couldn't identify the evil aura.
Previously, there was once when he and Huang Yueli were outside Saint Xie Ying's cave dwelling and were chased by Huang Sanbai and the rest. Under his heavy injuries, he had inhaled too much evil energy which resulted in him falling unconscious.
At that time, Cloudy Qilin Clan invited countless divine doctors to give him a diagnosis, but none of them knew what the situation was.
It was Huang Yueli who had personally infiltrated Cloudy Qilin Continent and changed her appearance to his side, to dual cultivate with him, that had woken him up.
So Li Moying had full confidence that a mere doctor like Divine Doctor Wu would not be able to see through Huang Yueli's secret.
But it was precisely because of this that Divine Doctor Wu didn't speak for a long time which made Li Moying feel even more uneasy.