In a city cloaked in shadows and riddled with secrets, humans and creatures of the night walk a razor-thin line of uneasy coexistence. Felix, a curious and reckless human, finds himself thrust into a dangerous world of vampires and werewolves after a chance encounter with Hyunjin, a brooding vampire with a dark past. As tensions between factions rise and an ancient enemy threatens their fragile peace, Felix and Hyunjin are drawn together in a volatile, love-to-hate-you connection that tests their loyalties, humanity, and survival.