Shen Yue learned many things about humans from that voice.
The human genome is incredibly mysterious, and people believe that genes determine human attributes, but different people obviously have different attributes. Shennong and others intended to create a perfect human body by rewriting genes.
This genetic rewriting wasn't like the modern scattershot approach. It was a true understanding of how the entire genetic system operated. Thus, they not only discovered the functions of some key genes but also could assess modifications to the entire genome.
In the view of that voice, the human genome should not be filled to capacity; doing so would trigger self-destruction. However, Shen Yue did not think this was the case.
Such people probably hadn't fully deciphered the secrets of the genome, or perhaps the thresholds of certain genes could no longer be achieved through genetic modification.
There are records of high monks transforming into rainbows on the Great Snow Mountain.
