Five hundred years in the past, a young Dongfang Yuechu stumbles into the realm of Tushan and ends up living there as a servant of low standing, an accident that ties his fate to Tushan Honghong. As they grow older, her hope for humans and demons to coexist peacefully becomes his purpose too, and he leaves Tushan behind to join the Yi Qi Dao Alliance, eventually rising to lead it. For a while their shared goal seems within reach, but something is closing in on them, threatening the fragile balance they have built together.