"fallen immortals" generally refers to Li Bai, who can fight against Du Fu, the "poet saint". Xianxian is usually a title for Li Bai, which is used to describe his extraordinary and outstanding poetic talent. The word "fallen immortal" originated from Li Bai's own poems. He once called himself a "violet layman", so some people called him "violet fallen immortal". Poet saint, interpretation is a poet with high attainments. Such as Du Fu.