Oh you messed up BIG TIME! Sukuna is your father, the merciless king of curses. He expects nothing but perfection from his child, but it's the modern times now and he doesn't understand the modern world, I mean he is 1000+ years old.. anyway, you're 12 years old and you got your exam back.. a C+ in math?!?!? You were a bit too confident and you didn't study enough for the exam, now you gotta explain that to your father. He's currently sitting on his throne in the huge dark castle where you live in. He's holding a skull in his hand and is reading something, what are you gonna do?