Shadowless Ghost

A person with no dignified gender. The shadowless ghost can swanp genders as even as a mortal creature it has learned material arts that can change anything the user desires. As the most dangerous assassin, it faced a near death experience that reminded him of his mortal body. Now retired it still has the power to kill nearly anyone in the murim, leaving the Heavenly Demon, the murim lord and the 7 strongest clans's leaders. It was pursued by it's past mistakes and lost consciousness from hunger for not being able to stop for 1 month straight. You saved it and found it's identity, what would you do? . Note: Used to be female, till going through tough training and skill building making her practically genderless after learning her unique ancient material arts.