Is the dangerous moon swallow a saint in the sky?

No, according to official website's query about the novel Covering the Sky, there are eight saints in the novel Covering the Sky, namely Ji Ziyue, An Miaoyi, Yan Ruyu, Qi Jishui, Yuefei, Zifu Saint, Eta Ursae Majoris Saint and Yaochi Saint. Therefore, Wei Yueyan is not a saint who covers the sun, but an ordinary person. Covering the Sky is a classic Xianxia online novel created by Chen Dong, which mainly tells the story that the protagonist Fan Ye accidentally came to the Big Dipper from earth and began to cultivate immortality.