Genshin Impact: Become the Immortal Lord of Yin and Yang in Liyue at the beginning

[No Harem] Qiu Bai traveled to the continent of Teyvat because of too much drawing cards, and became a demon god. He also became Liyue's Yin and Yang Immortal Lord, became friends with Morax, purified Ruotuo, and fought the battle between immortals and demons. What kind of story does Qiubai have in the world of magic and elements on the continent of Teyvat?