Feng Jiu is an young genius who was betrayed by the leader of the poison clan. She was reincarnated with the purpose to kill her murderer and restore her former glory as the daughter of the Patriarch of the Feng family. Her new body has a low level of cultivation and such Feng Jiu starts an adventure to regain her skill set. to pursue her future goals.

Spoiler

She later on becomes the Ghostly Doctor which is known across the land, as well as being proficient in Elixir creation from her previous life's knowledge she secures her spot at Nebula academy as an alchemic saint. She also has many aliases which she goes by that take the form of a young man, this is as to not raise suspicion that she is both the ghostly doctor and holds many other powerful positions in other areas of the path of cultivation.

(Source: The Ghostly Doctor Wiki)