Vicious Queen Knightwood Acade - Rowen Black

Each year, the Knightwood Academy chooses the best of the best to join them.
Males from different factions are sent there to train.
This year, it's my brother's turn to take part, but sickness eats at his body every day, making it impossible for him to take part in the training.
I have no choice but to take his place, not only to save him from dying during training but also because I need the money for his medicine. It's my job as his sister to do this for him.
I'm not worried. I know I can do this. I'm as fast and deadly as any man. My father made sure both my brother and I are very capable with a sword.
At the Academy, I have to share a room with the four men who will now be my unit. We have been ordered to grow close by sharing every moment of every day with each other.
My new unit mates don't believe I will be able to keep them alive in the coming trials, because of my size, but I would prove them wrong no matter what it takes.
If they find out who I really am, I'll be sentenced to death, and if no one can pay for my brother's medicine, he'll share in my fate.
Will I be able to keep my identity a secret to save my brother's life?
I'm not sure, but I have to try.
It's my only option.

Warning: Knightwood Academy is set in its own Dystopian world.
Slow-burn and dark Reverse Harem novel. Triggering elements appear in the story.