Why does Moling in saint seiya the Saint wear a mask?

Moling is a silver saint of Aquila. He was also the master of saint seiya, a saint.

Among the saints, the warrior who guards the goddess must be male, and if a woman wants to be a saint, she must wear a mask to show that she has given up her female body. If a man sees his true colors, he will either kill him or fall in love with him.

As for the statement that Moring is the sister of saint seiya, a saint, Moring's information is very similar to Xinghua's, and she also has a lost brother.

So saint seiya thought Moring might be his sister. But it was impossible from the beginning. On the day when saint seiya, a saint, went to Greece, Xinghua disappeared from Japan. By the time the saint saint seiya arrived in Greece, Moling was already a silver saint. . . It can't be that fast. . . . .