subject is born as kwon heesun to a family of four. 

at the age of 11 the subject begins to emit strange behaviours that worries the parents. she is often seen wearing baggier clothing than what fits her lanky body and begins to show signs of aggression. (large sections of crystal have began ripping her skin and forming on her back, almost like an extended piece of her spine. she spends two whole nights trying to saw them off.)。

once the subject turns 16 she is reported to of taken part in a fight against school mates that have grown with parents against mutants. in the fight, her sleeve is ripped exposing her forearm covered in small jagged piecese of amethyst protruding from her skin. (by now she can sometimes control the crystal appendages to retract, such as the ones that appear on her back frequently. but the small shards that keep growing on her arms have gotten worse.) after being exposed as a mutant, the subject leaves home and goes on the run from local authorities trying to track her down。

the subject is 18 when she's last spotted in public again. at first authorities are unable to connect her to the missing girl 'kwon heesun' and only see the subject as a newly emerged mutant. the subject is attacking a man in an alleyway, already having killed him and is rummaging through his belongings when a group of teenagers come across the mutant. a moment of panic seizes the subject and in a blink one of the onlooking teenagers body is encased in a thin layer of crystal. when more reports file in about a mutant that has stone freezing powers like medusa, the authorities step in and begin hunting.

when the subject is 20 it is informed to the authorities that medusa has come under the protection of dolos' school for the peculiar. all cases against the subject are put on hold till her exit from the school.