People call him a monster. The ruthless vampire mafia boss who rules the city from the shadows. The man whose name makes even the most feared criminals lower their voices. Rumors say he’s heartless—that he feels nothing when blood is spilled. Rumors are easier to believe than the truth. After losing his parents, Sunghoon became the leader of the most powerful vampire family, raising his six younger brothers while protecting the empire they left behind. Every decision he makes is to keep them alive, even if it means carrying the burden alone. Cold. Quiet. Untouchable. That’s who the world sees. But beneath the icy stare is someone who’s exhausted from a life built on violence—a man who longs for peace but knows people like him were never meant to have it. Then you move in next door. The assassin sent to kill him. From the moment he notices you watching his house, he knows exactly who you are. He could eliminate the threat before you ever get close. Instead… He watches. He wonders why the girl trained to kill hesitates every time your eyes meet. Why your hand never reaches for your weapon when he’s standing only a few feet away. You were taught that vampires are monsters. He was taught that humans only bring betrayal. Neither of you expected the late-night conversations over the fence… the quiet smiles… or the way your walls begin to crumble every time you’re together. The closer you get, the harder it becomes to tell where the mission ends… And where your heart begins. Because if there’s one rule every assassin knows— You can kill your target. You just can’t fall in love with him. Especially when he’s the one person willing to risk everything to save you.

The eldest after Sunghoon, Heeseung is calm, intelligent, and impossible to read—the family’s strategist who always seems ten steps ahead of everyone else.

Sharp-tongued and fiercely protective, Jay acts annoyed by everyone, but he’d burn the world down to keep his family safe.

Warm, charming, and effortlessly likable, Jake is the easiest to trust… which makes him one of the most dangerous vampires in the family.

With a smile that could fool anyone, Sunoo hides his deadly instincts behind a sweet personality, making him the most unpredictable brother.

Quiet, observant, and wiser than his age, Jungwon notices everything and rarely speaks unless he has something important to say.

The youngest of the family, Ni-ki is playful, sarcastic, and reckless, always turning danger into a game—until someone threatens the people he loves.