Fics like To Claim a Poisoned Blade

The Setup: sunoo (Omega) was raised in a brutal elite assassin cult controlled by a rival empire, brainwashed through physical conditioning to target the royal bloodline. His final target: Crown Prince sunghoon (Alpha),Alpha who people afraid to cross lines with The Dynamic: Captured during a failed assassination, Sunoo (an Omega cult assassin) is forced into a cruel trap. Sunghoon—a ruthless Alpha king whom the kingdom fears—discovers Sunoo’s younger brother, Ni-ki, and uses him as leverage. Sunghoon issues a rare royal decree, giving Sunoo a cold ultimatum: become his bonded captive mate and surrender the cult's secrets, or watch Ni-ki die. Trapped under the same roof as the tyrant he hates, Sunoo must submit to save his brother, while Sunghoon works to break his resolve.

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