A teenage girl wakes up in a world that has already forgotten her. She was supposed to matter in this life, supposed to have power, status, a name that meant something. She has none of those things now. The immortal cultivation world she enters doesn't care about her desperation to reclaim what was taken. It only cares about who you are right now, and right now she is nobody. Every small victory she claws toward is immediately undercut by the reminder that the system itself is stacked against her survival. The show doesn't pretend her struggle will be pretty or that effort alone guarantees transcendence.
Bu Bai Xian Di is a fantasy ONA.