In a world ravaged by a mysterious virus, humanity clings to existence while a new breed of predator stalks the night. Trinity, a 'Nightstalker' with enhanced senses and a thirst for blood she fights to control, navigates this treacherous landscape. When an unexpected encounter with human survivors forces her to choose between her primal instincts and the last vestiges of her humanity, she embarks on a dangerous journey. Will she lead them to safety, or succumb to the virus that rages within?

Park Sunghoon carries a terrifying secret: he's a vampire, struggling daily against his insatiable hunger. Every human heartbeat is a drum, every scent a maddening tease. But when he meets Lee Heeseung, his biology teacher, something shifts. Heeseung's calm presence, his unique scent, and his unexpected kindness become both a dangerous temptation and a fragile anchor in Sunghoon's monstrous existence. Can Sunghoon resist the urge to feed on the one person who sees past his pallor and quiet intensity, or is Heeseung destined to become another victim in Sunghoon's desperate fight for control?