They Kicked Me Out, I Came Back Champion

I died watching my step-sister smile as I fell to my death. The poison she fed me for years had finally worked, and the world called me a cheating disgrace.
Reborn six months before the Olympics, I'm back with the memory of her betrayal burning in my veins. This time, I see her every sly move coming. This time, I know about the dropper of poison she hides behind her back.
They took my gold, my family, and my life. But they made one mistake: they didn't make sure I was finished.
This time, the gold isn't the prize. It's the weapon. And I will use it to destroy them all.