rudefantasy

Guys I'm looking for a manhwa, it has a novel as well. From what I remember from the plot it was a perspective of the man with his girl niece which happens to have awaken ability that only grows. The girl got the ability start from F and she face assasination from a chinese ability user that has the same ability as her but her uncle the MC killed the chinese bcs that is the main point of her ability to be the only one exist. So the niece father or MC brother is brainwash by a japanese woman. So the story like some kind of space league somwthing bcs i remember they had tournament against elves and this is transmigration. I forgot the title, I read it last year but translation was not yet finish so I want to continue it now.

I'm looking for a manhwa entitled Leviathan by Lee Gyuntak and I was searching it I couldn't find it. Does anyone know?