The others may not have been able to sense Gu Ruoyun's actions but he, as a high-level Martial Honor, was able to clearly sense the mental strength Gu Ruoyun was emitting.
She was using her mental energy to clean the impurities in the herbs!
The herbs have now been purified.
"Gu Shengxiao's little sister?" A peculiar light flashed in the Sect Master's eyes as he mumbled to himself, "Why have I never heard Shengxiao mention that he had a little sister like this? Kun Nan was very nervous when he was refining the pill a while ago, he clearly did not have a lot of confidence in himself. However, her movements have been leisurely and natural, as if she had a hundred percent guarantee for success."
Besides, in the eyes of others, the steps used between the two of them may look the same but the Sect Master could sense very clearly the difference in medicinal powers in the pill cauldron.
