The archaeology college student "Gu Xiaobai" and "White Bone Demon" exchanged souls and came to the world of immortals. Immortals, ancient styles, and even...modern technology! But the monsters have long been extinct by the Xianjia, and the White Bone Monster is the only monster in the world. Gu Xiaobai was rescued by Xianmen [Tianlanmen] and became the only little junior sister... Can she find a way to return to her original body in Tianlanmen?