Su Jinyu's parents adopted a younger sister for her when she was eight years old. The younger sister was very well-behaved and Su Jinyu liked her very much, until her younger sister changed and she was killed by the changed younger sister.
"Ding, the vicious female supporting character successfully saved the system... Eh? Why are you dying, host?!"
Su Jinyu didn't die, she dressed up and became a vicious female supporting character. Her mission was to "save" the fate of this vicious female supporting character.
Su Jinyu: The word 'save' is very spiritual:)
Brainless cookie, everything is for the heroine, no squirting, no squirting_(:3″∠?)_
I'm not sure yet whether there is CP (I guess not), so I marked No CP first.
Intention: to be a good person