The clang of steel, the slick warmth of fresh blood on a blade – these are the constant companions for those who earn their keep in the brutal outskirts. Here, life itself is a luxury, bought only with coin, and coin is often paid in violence. Every grueling battle, every risky contract completed, fuels one desperate hope: to keep the shadows of illness from claiming a loved one.

That’s the harsh reality for Cassmire, the mercenary acting as her younger sister Aria’s loyal sword. Her hands are stained, her soul weary, but her resolve burns bright – until a sudden, jarring fall sends her consciousness reeling. Memories explode into her mind: not of a sword-for-hire, but of a wicked stepsister from a previous life, a villainess whose original story led to Aria's torment. Now, armed with the knowledge of a brutal destiny, Cassmire vows fierce redemption. Can she truly rewrite a future that’s already been penned in this new manhwa?

Also known as: 카시미르: 동생을 섬기는 기사, Cassmire: The Knight Who Serves Her Younger Sister.