Playing With Mortals? Then I Invite You All to Your Death!

I'm a transmigrator. I used to think I was destined to be alone, whether in my past life or this one. But after seeing my younger sister in this life, and learning that our parents' deaths weren't an accident but someone else's game, I think I finally understand my mission.

This is a world with hidden dangers, because you never know what terrifying entity might emerge from the darkness the next second.

With the System's help, this variable called me will become their nightmare!