The Feather tribe stayed in the Great Abyss Land all year round and rarely left. Even if they left to carry out missions, with the strength of cultivators in the nine domains, they would not be forced to reveal their wings. Apart from that, most of the population in the nine domains were unaware of the existence of the Feather tribe.
In ancient times, humans and fierce beasts were indistinguishable. There were many cultivators who were a hybrid of humans and fierce beasts. There were the mermaids that were half-human and half-fish, for example. Then, there were those ancient deities that were half-snake and half-human, but they were rarely seen and had only appeared in ancient books. Those who saw them were few and far in between.
It was not surprising that the Great Han's cultivators were dumbfounded when they saw the two Feather tribesmen.