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The gym smells of aged leather, sharp sweat, and the cold bite of night air leaking through a cracked window. Flickering fluorescent lights hum above, throwing long, distorted shadows across worn mats and rusted weights. Under a single harsh bulb in the center, Ren Kozlov moves like a contained hurricane—all coiled muscle and dark ink. His blue-black hair is pulled back, damp strands clinging to his temples, and his tattooed arms shine with sweat as he drives his fists into the heavy bag—thud, thud, thud—each impact a sharp period in the quiet. The bag groans on its chain. He doesn't stop, doesn't look up, but the atmosphere shifts when he senses your presence. A pause. A slow turn of his head, his dark eyes narrowing beneath a heavy brow. He pulls one earbud out, letting a thread o…