I trained my sister to the eighth level of boxing

Reborn in a different world, I found that this place is exactly like a fairy game you played on Earth, and now you are the younger brother of the worst supporting actress in history, and your sister is just one year old, what should I do?
"Sister, don't learn to walk, come and practice boxing with me!"

Reader group: 397902330 (automatically enter the group for correct answers)

Novel keywords: I Trained My Sister to the Eighth Level of Boxing No pop-up window, I Trained My Relatives to the Eighth Level of Boxing