Playing Elbow Technique in a Game Invasion: Jujutsu Kaisen

A fanfic about a game invasion. (The golden finger is a divine gift: various cursed techniques from Jujutsu Kaisen.) My name is Xun Huan. I'm five years old, and I'm a transmigrator. Five months ago, at my grandfather's funeral, I regained the memories of my previous life.

What I find most curious is my surname in this life.

Yu.

Yu Xunhuan.

My father's name is Yu Qingshan, my mother's is Yi Qiuguo, and my grandmother's is Shen Yushi.

And then there's my older sister, who's seven this year.

Yu Xunge.

I remember watching Jujutsu Kaisen before I transmigrated...

The good news is, I'm not some background character or cannon fodder. I'm the protagonist's own younger brother.

The bad news is that in the original story, this younger brother of mine is a scheming villainess who gets humiliated in almost every scene, or is on her way to getting humiliated.

You might think it's not a big deal. I just have to avoid acting like I did in the original.

Now for the worst news: my sister has a revenge-and-rebirth storyline, and when the time comes, there's a chance her hatred will shoot straight to the max.