Cruel King (Royal Elite #0 - A Prequel) by Rina Kent

He’s no fairy tale king.

Levi
Here, little princess. I'm your king.
You have three rules.
Bow. Break. Bend the knee.
Fight me all you want, but soon enough, you'll be chanting long live the king.

Astrid
One day I'm Royal Elite School's small fly, the next I'm hunted and left to die.
He doesn't only shred my life to parts, but he's also coming after my heart.
He thinks he broke me, but the new princess will bring the king to his knees.